Space library
The rebuilt English edition now exposes the full topic index from the original archive — not just a handful of planets.
3I/ATLAS: Facts and Fiction
Learn what 3I/ATLAS: Facts and Fiction tells us about icy material, orbits and the small-body population of our Solar System.
3I/ATLAS: An Interstellar Comet
Learn what 3I/ATLAS: An Interstellar Comet tells us about icy material, orbits and the small-body population of our Solar System.
55 Cancri
Explore 55 Cancri and what astronomers have learned about planets beyond our Solar System.
Earth
Our home world: a rocky planet with liquid oceans, a protective atmosphere and one natural moon.
Earth and Moon
Explore Earth and Moon, its parent planet, surface, orbit and what makes this moon worth studying.
Eagle Nebula
Explore Eagle Nebula, the glowing gas, dust and stellar processes that shape this deep-space object.
The Smallest Things in Space
A clear English guide to The Smallest Things in Space, with visuals, context and direct links to related space topics.
Alpha Centauri
Explore Alpha Centauri and what astronomers have learned about planets beyond our Solar System.
Other Solar Systems and Exoplanets
Explore Other Solar Systems and Exoplanets and what astronomers have learned about planets beyond our Solar System.
Andromeda Galaxy
The nearest large galaxy to the Milky Way, with a bright core, dust lanes and a vast spiral disc.
Milky Way, Solar System and Famous Galaxies
See how Milky Way, Solar System and Famous Galaxies fits into the wider universe, from its structure and bright regions to the scale involved.
Artemis II Route and Mission Review
Follow Artemis II Route and Mission Review and understand the mission goals, route and why it matters for future exploration.
Artemis II: Return to Earth
Follow Artemis II: Return to Earth and understand the mission goals, route and why it matters for future exploration.
Space Image Library
A clear English guide to Space Image Library, with visuals, context and direct links to related space topics.
Start Here
A clear English guide to Start Here, with visuals, context and direct links to related space topics.
Inner and Outer Planets
Learn the essentials of Inner and Outer Planets and how it connects to the Sun, planets, moons and orbital motion.
Callisto — Visual Guide
Explore Callisto — Visual Guide, its parent planet, surface, orbit and what makes this moon worth studying.
Callisto
Explore Callisto, its parent planet, surface, orbit and what makes this moon worth studying.
Hubble and Euclid View the Cat’s Eye Nebula
Explore Hubble and Euclid View the Cat’s Eye Nebula, the glowing gas, dust and stellar processes that shape this deep-space object.
Centaurus A
See how Centaurus A fits into the wider universe, from its structure and bright regions to the scale involved.
Ceres — Visual Guide
Explore Ceres — Visual Guide and the small icy worlds that reveal how the outer Solar System is structured.
Ceres
Explore Ceres and the small icy worlds that reveal how the outer Solar System is structured.
The Moon in Simple English
Explore The Moon in Simple English, its parent planet, surface, orbit and what makes this moon worth studying.
The Moon: Complete Guide
Understand phases, the near and far sides, craters, water ice, gravity and why we keep returning to the Moon.
The Sun
The star that powers almost every surface ecosystem on Earth and holds the Solar System together with gravity.
Deimos — Visual Guide
Explore Deimos — Visual Guide, its parent planet, surface, orbit and what makes this moon worth studying.
Deimos (Moon of Mars)
Explore Deimos (Moon of Mars), its parent planet, surface, orbit and what makes this moon worth studying.
Dione
Explore Dione, its parent planet, surface, orbit and what makes this moon worth studying.
Whirlpool Galaxy
See how Whirlpool Galaxy fits into the wider universe, from its structure and bright regions to the scale involved.
Triangulum Galaxy
See how Triangulum Galaxy fits into the wider universe, from its structure and bright regions to the scale involved.
The Story of a Dwarf Planet — Visual Guide
Explore The Story of a Dwarf Planet — Visual Guide and the small icy worlds that reveal how the outer Solar System is structured.
Dwarf Planet Extra Maps
Explore Dwarf Planet Extra Maps and the small icy worlds that reveal how the outer Solar System is structured.
Dwarf Planet Gallery
Explore Dwarf Planet Gallery and the small icy worlds that reveal how the outer Solar System is structured.
Dwarf Planet Overview — Visual Guide
Explore Dwarf Planet Overview — Visual Guide and the small icy worlds that reveal how the outer Solar System is structured.
Extended Dwarf Planet Poster — Visual Guide
Explore Extended Dwarf Planet Poster — Visual Guide and the small icy worlds that reveal how the outer Solar System is structured.
Real Galaxies and Space Images
See how Real Galaxies and Space Images fits into the wider universe, from its structure and bright regions to the scale involved.
Enceladus — Visual Guide
Explore Enceladus — Visual Guide, its parent planet, surface, orbit and what makes this moon worth studying.
Enceladus
Explore Enceladus, its parent planet, surface, orbit and what makes this moon worth studying.
Eris — Visual Guide
Explore Eris — Visual Guide and the small icy worlds that reveal how the outer Solar System is structured.
Eris map variant 2 — Visual Guide
Learn the essentials of Eris map variant 2 — Visual Guide and how it connects to the Sun, planets, moons and orbital motion.
Eris map variant — Visual Guide
Learn the essentials of Eris map variant — Visual Guide and how it connects to the Sun, planets, moons and orbital motion.
Eris
Explore Eris and the small icy worlds that reveal how the outer Solar System is structured.
Europa — Visual Guide
Explore Europa — Visual Guide, its parent planet, surface, orbit and what makes this moon worth studying.
Europa
Explore Europa, its parent planet, surface, orbit and what makes this moon worth studying.
Imagination in Space
A clear English guide to Imagination in Space, with visuals, context and direct links to related space topics.
Ganymede — Visual Guide
Explore Ganymede — Visual Guide, its parent planet, surface, orbit and what makes this moon worth studying.
Ganymede
Explore Ganymede, its parent planet, surface, orbit and what makes this moon worth studying.
GJ 1214
Explore GJ 1214 and what astronomers have learned about planets beyond our Solar System.
Gonggong — Visual Guide
Explore Gonggong — Visual Guide and the small icy worlds that reveal how the outer Solar System is structured.
Gonggong map variant — Visual Guide
Learn the essentials of Gonggong map variant — Visual Guide and how it connects to the Sun, planets, moons and orbital motion.
Gonggong
Explore Gonggong and the small icy worlds that reveal how the outer Solar System is structured.
Large Magellanic Cloud
See how Large Magellanic Cloud fits into the wider universe, from its structure and bright regions to the scale involved.
Haumea — Visual Guide
Explore Haumea — Visual Guide and the small icy worlds that reveal how the outer Solar System is structured.
Haumea map variant 2 — Visual Guide
Learn the essentials of Haumea map variant 2 — Visual Guide and how it connects to the Sun, planets, moons and orbital motion.
Haumea map variant 3 — Visual Guide
Learn the essentials of Haumea map variant 3 — Visual Guide and how it connects to the Sun, planets, moons and orbital motion.
Haumea map variant — Visual Guide
Learn the essentials of Haumea map variant — Visual Guide and how it connects to the Sun, planets, moons and orbital motion.
Haumea
Explore Haumea and the small icy worlds that reveal how the outer Solar System is structured.
HD 209458
Explore HD 209458 and what astronomers have learned about planets beyond our Solar System.
Major Moons and Their Orbits — Visual Guide
Learn the essentials of Major Moons and Their Orbits — Visual Guide and how it connects to the Sun, planets, moons and orbital motion.
Major Moons in Order — Visual Guide
Learn the essentials of Major Moons in Order — Visual Guide and how it connects to the Sun, planets, moons and orbital motion.
Major Moons Poster — Visual Guide
Learn the essentials of Major Moons Poster — Visual Guide and how it connects to the Sun, planets, moons and orbital motion.
Major Moons Poster — Variant — Visual Guide
Learn the essentials of Major Moons Poster — Variant — Visual Guide and how it connects to the Sun, planets, moons and orbital motion.
HR 8799
Explore HR 8799 and what astronomers have learned about planets beyond our Solar System.
Comet 41P Changed Its Spin Direction
Learn what Comet 41P Changed Its Spin Direction tells us about icy material, orbits and the small-body population of our Solar System.
Iapetus
Explore Iapetus, its parent planet, surface, orbit and what makes this moon worth studying.
Space, Step by Step
Learn the essentials of Space, Step by Step and how it connects to the Sun, planets, moons and orbital motion.
Io — Visual Guide
Explore Io — Visual Guide, its parent planet, surface, orbit and what makes this moon worth studying.
Io
Explore Io, its parent planet, surface, orbit and what makes this moon worth studying.
Jupiter
Learn the essentials of Jupiter and how it connects to the Sun, planets, moons and orbital motion.
Jupiter and Its Moons
Explore Jupiter and Its Moons, its parent planet, surface, orbit and what makes this moon worth studying.
K2-18
Explore K2-18 and what astronomers have learned about planets beyond our Solar System.
KELT-9
Explore KELT-9 and what astronomers have learned about planets beyond our Solar System.
Kepler-186
Explore Kepler-186 and what astronomers have learned about planets beyond our Solar System.
Kepler-452
Explore Kepler-452 and what astronomers have learned about planets beyond our Solar System.
Kepler-90
Explore Kepler-90 and what astronomers have learned about planets beyond our Solar System.
Small Magellanic Cloud
See how Small Magellanic Cloud fits into the wider universe, from its structure and bright regions to the scale involved.
Comets Explained
Learn what Comets Explained tells us about icy material, orbits and the small-body population of our Solar System.
Crab Nebula
Explore Crab Nebula, the glowing gas, dust and stellar processes that shape this deep-space object.
Kuiper Belt Infographic — Visual Guide
Explore Kuiper Belt Infographic — Visual Guide and the small icy worlds that reveal how the outer Solar System is structured.
The Kuiper Belt — Visual Guide
Explore The Kuiper Belt — Visual Guide and the small icy worlds that reveal how the outer Solar System is structured.
Kuiper Belt Space Map — Visual Guide
Explore Kuiper Belt Space Map — Visual Guide and the small icy worlds that reveal how the outer Solar System is structured.
Kuiper Belt Guide Poster — Visual Guide
Explore Kuiper Belt Guide Poster — Visual Guide and the small icy worlds that reveal how the outer Solar System is structured.
Latest Space News
Learn the essentials of Latest Space News and how it connects to the Sun, planets, moons and orbital motion.
LHS 1140
Explore LHS 1140 and what astronomers have learned about planets beyond our Solar System.
Messier 87
See how Messier 87 fits into the wider universe, from its structure and bright regions to the scale involved.
Moon Surface and Craters
Explore Moon Surface and Craters, its parent planet, surface, orbit and what makes this moon worth studying.
Why the Lunar South Pole Matters
Explore Why the Lunar South Pole Matters, its parent planet, surface, orbit and what makes this moon worth studying.
Moon Phases Explained
Explore Moon Phases Explained, its parent planet, surface, orbit and what makes this moon worth studying.
Moon Missions Today
Explore Moon Missions Today, its parent planet, surface, orbit and what makes this moon worth studying.
Makemake — Visual Guide
Explore Makemake — Visual Guide and the small icy worlds that reveal how the outer Solar System is structured.
Makemake
Explore Makemake and the small icy worlds that reveal how the outer Solar System is structured.
Moonengallery
Learn the essentials of Moonengallery and how it connects to the Sun, planets, moons and orbital motion.
Mars
Learn the essentials of Mars and how it connects to the Sun, planets, moons and orbital motion.
Mars and moons
Explore Mars and moons, its parent planet, surface, orbit and what makes this moon worth studying.
More Moons to Explore — Visual Guide
Learn the essentials of More Moons to Explore — Visual Guide and how it connects to the Sun, planets, moons and orbital motion.
Mercury
Learn the essentials of Mercury and how it connects to the Sun, planets, moons and orbital motion.
Mimas — Visual Guide
Explore Mimas — Visual Guide, its parent planet, surface, orbit and what makes this moon worth studying.
Mimas
Explore Mimas, its parent planet, surface, orbit and what makes this moon worth studying.
Near and Far Side of the Moon
Explore Near and Far Side of the Moon, its parent planet, surface, orbit and what makes this moon worth studying.
Neptune
Learn the essentials of Neptune and how it connects to the Sun, planets, moons and orbital motion.
Nereid
Explore Nereid, its parent planet, surface, orbit and what makes this moon worth studying.
Nebulae
Explore Nebulae, the glowing gas, dust and stellar processes that shape this deep-space object.
NGC 1300
See how NGC 1300 fits into the wider universe, from its structure and bright regions to the scale involved.
Moons of Neptune
Explore Moons of Neptune, its parent planet, surface, orbit and what makes this moon worth studying.
Moons of Uranus
Explore Moons of Uranus, its parent planet, surface, orbit and what makes this moon worth studying.
More Moons of Jupiter
Learn the essentials of More Moons of Jupiter and how it connects to the Sun, planets, moons and orbital motion.
Oberon
Explore Oberon, its parent planet, surface, orbit and what makes this moon worth studying.
Our Solar System
Learn the essentials of Our Solar System and how it connects to the Sun, planets, moons and orbital motion.
Our Inner Planets
Learn the essentials of Our Inner Planets and how it connects to the Sun, planets, moons and orbital motion.
Orcus — Visual Guide
Explore Orcus — Visual Guide and the small icy worlds that reveal how the outer Solar System is structured.
Orcus map variant — Visual Guide
Learn the essentials of Orcus map variant — Visual Guide and how it connects to the Sun, planets, moons and orbital motion.
Orcus
Explore Orcus and the small icy worlds that reveal how the outer Solar System is structured.
Orion Nebula
A bright stellar nursery in Orion where young stars illuminate a huge cloud of gas and dust.
Horsehead Nebula
Explore Horsehead Nebula, the glowing gas, dust and stellar processes that shape this deep-space object.
Pan
Explore Pan, its parent planet, surface, orbit and what makes this moon worth studying.
Pandora
Explore Pandora, its parent planet, surface, orbit and what makes this moon worth studying.
Phobos — Visual Guide
Explore Phobos — Visual Guide, its parent planet, surface, orbit and what makes this moon worth studying.
Phobos (Moon of Mars)
Explore Phobos (Moon of Mars), its parent planet, surface, orbit and what makes this moon worth studying.
Pinwheel Galaxy
See how Pinwheel Galaxy fits into the wider universe, from its structure and bright regions to the scale involved.
Planet Order
Learn the essentials of Planet Order and how it connects to the Sun, planets, moons and orbital motion.
Planets
Learn the essentials of Planets and how it connects to the Sun, planets, moons and orbital motion.
Pluto — Visual Guide
Explore Pluto — Visual Guide and the small icy worlds that reveal how the outer Solar System is structured.
Pluto
A complex icy dwarf planet beyond Neptune, known for its bright heart-shaped region and large moon Charon.
Portia
Explore Portia, its parent planet, surface, orbit and what makes this moon worth studying.
Prometheus
Explore Prometheus, its parent planet, surface, orbit and what makes this moon worth studying.
Proxima Centauri
Explore Proxima Centauri and what astronomers have learned about planets beyond our Solar System.
Quaoar — Visual Guide
Explore Quaoar — Visual Guide and the small icy worlds that reveal how the outer Solar System is structured.
Quaoar map variant — Visual Guide
Learn the essentials of Quaoar map variant — Visual Guide and how it connects to the Sun, planets, moons and orbital motion.
Quaoar
Explore Quaoar and the small icy worlds that reveal how the outer Solar System is structured.
Rhea
Explore Rhea, its parent planet, surface, orbit and what makes this moon worth studying.
Ring Nebula
Explore Ring Nebula, the glowing gas, dust and stellar processes that shape this deep-space object.
Space Glossary
A clear English guide to Space Glossary, with visuals, context and direct links to related space topics.
New Space Images: Moon, Missions and Deep Space
A clear English guide to New Space Images: Moon, Missions and Deep Space, with visuals, context and direct links to related space topics.
Space Maps and Overview Images
A clear English guide to Space Maps and Overview Images, with visuals, context and direct links to related space topics.
Saturn
Learn the essentials of Saturn and how it connects to the Sun, planets, moons and orbital motion.
Saturn and Its Moons
Explore Saturn and Its Moons, its parent planet, surface, orbit and what makes this moon worth studying.
Sedna — Visual Guide
Explore Sedna — Visual Guide and the small icy worlds that reveal how the outer Solar System is structured.
Sedna map — Visual Guide
Learn the essentials of Sedna map — Visual Guide and how it connects to the Sun, planets, moons and orbital motion.
Sedna map variant — Visual Guide
Learn the essentials of Sedna map variant — Visual Guide and how it connects to the Sun, planets, moons and orbital motion.
Sedna
Explore Sedna and the small icy worlds that reveal how the outer Solar System is structured.
Sombrero Galaxy
See how Sombrero Galaxy fits into the wider universe, from its structure and bright regions to the scale involved.
Galaxies: Real Images and Visual Guides
See how Galaxies: Real Images and Visual Guides fits into the wider universe, from its structure and bright regions to the scale involved.
Tadpole Galaxy
See how Tadpole Galaxy fits into the wider universe, from its structure and bright regions to the scale involved.
Tau Ceti
Explore Tau Ceti and what astronomers have learned about planets beyond our Solar System.
Tethys
Explore Tethys, its parent planet, surface, orbit and what makes this moon worth studying.
Titan — Visual Guide
Explore Titan — Visual Guide, its parent planet, surface, orbit and what makes this moon worth studying.
Titan
Explore Titan, its parent planet, surface, orbit and what makes this moon worth studying.
TOI-700
Explore TOI-700 and what astronomers have learned about planets beyond our Solar System.
TRAPPIST-1
A compact system of seven rocky planets around a cool red dwarf roughly 40 light-years away.
Triton — Visual Guide
Explore Triton — Visual Guide, its parent planet, surface, orbit and what makes this moon worth studying.
Triton
Explore Triton, its parent planet, surface, orbit and what makes this moon worth studying.
View of Jupiter from a Moon — Visual Guide
Explore View of Jupiter from a Moon — Visual Guide, its parent planet, surface, orbit and what makes this moon worth studying.
Uranus
Learn the essentials of Uranus and how it connects to the Sun, planets, moons and orbital motion.
Venus
Learn the essentials of Venus and how it connects to the Sun, planets, moons and orbital motion.
Why Are We Going Back to the Moon?
Explore Why Are We Going Back to the Moon?, its parent planet, surface, orbit and what makes this moon worth studying.
Cartwheel Galaxy
See how Cartwheel Galaxy fits into the wider universe, from its structure and bright regions to the scale involved.
WASP-12
Explore WASP-12 and what astronomers have learned about planets beyond our Solar System.
Water and Ice on the Moon
Explore Water and Ice on the Moon, its parent planet, surface, orbit and what makes this moon worth studying.
Solar System Images Explained
Learn the essentials of Solar System Images Explained and how it connects to the Sun, planets, moons and orbital motion.
Solar System Visual Journey
Learn the essentials of Solar System Visual Journey and how it connects to the Sun, planets, moons and orbital motion.
Solar System with Moons and Dwarf Planets — Visual Guide
Learn the essentials of Solar System with Moons and Dwarf Planets — Visual Guide and how it connects to the Sun, planets, moons and orbital motion.
Solar System
Learn the essentials of Solar System and how it connects to the Sun, planets, moons and orbital motion.
Gravity and Temperature on the Moon
Explore Gravity and Temperature on the Moon, its parent planet, surface, orbit and what makes this moon worth studying.
Black Eye Galaxy
See how Black Eye Galaxy fits into the wider universe, from its structure and bright regions to the scale involved.
Brown Dwarf
Explore Brown Dwarf and the stellar physics that shape how stars form, shine, evolve and die.
Red Dwarf
Explore Red Dwarf and the stellar physics that shape how stars form, shine, evolve and die.
Sun-like Yellow Star
Explore Sun-like Yellow Star and the stellar physics that shape how stars form, shine, evolve and die.
Blue Giant
Explore Blue Giant and the stellar physics that shape how stars form, shine, evolve and die.
Red Supergiant
Explore Red Supergiant and the stellar physics that shape how stars form, shine, evolve and die.
White Dwarf
Explore White Dwarf and the stellar physics that shape how stars form, shine, evolve and die.
Supernova
Explore Supernova and the stellar physics that shape how stars form, shine, evolve and die.
Stellar Black Hole
Explore Stellar Black Hole and how gravity, mass and event horizons define black holes at different scales.
Supermassive Black Hole
Explore Supermassive Black Hole and how gravity, mass and event horizons define black holes at different scales.
Intermediate-Mass Black Hole
Explore Intermediate-Mass Black Hole and how gravity, mass and event horizons define black holes at different scales.
Primordial Black Hole
Explore Primordial Black Hole and how gravity, mass and event horizons define black holes at different scales.