Sky Library
Learn about the sky
Beginner-friendly notes on planets, bright stars, galaxies, nebulae, and clusters — with realistic descriptions of what you may actually see through a telescope.
Planets

Mercury
PlanetThe innermost planet — always low, close to sunrise or sunset.
Intermediate

Venus
PlanetThe brightest planet — often mistaken for an aircraft light.
Beginner

Mars
PlanetThe red planet — its colour is unmistakable to the naked eye.
Beginner

Jupiter
PlanetThe largest planet — and the easiest to see with real telescopic detail.
Beginner

Saturn
PlanetFamous for its rings — one of the most memorable sights in a small telescope.
Beginner

Uranus
PlanetA pale-blue ice giant, just at the edge of naked-eye visibility.
Intermediate

Neptune
PlanetThe most distant major planet — always requires a telescope.
Challenging
Moon
Bright stars
Sirius
Bright starThe brightest star in the night sky — impossible to miss when it is above the horizon.
Beginner
Vega
Bright starA brilliant blue-white summer star and one of the corners of the Summer Triangle.
Beginner
Polaris
Bright starThe current northern pole star — its position barely changes over the night.
Beginner
Betelgeuse
Bright starA vast red supergiant — one of the largest stars visible to the naked eye.
Beginner
Rigel
Bright starA brilliant blue supergiant marking Orion's foot.
Beginner
Arcturus
Bright starThe brightest star in the northern celestial hemisphere — a warm orange.
Beginner
Capella
Bright starA brilliant yellow star at the top of a winter constellation — actually a system of four stars.
Beginner
Altair
Bright starA close, fast-spinning star — the southern corner of the Summer Triangle.
Beginner
Aldebaran
Bright starThe 'eye of the Bull' — an orange giant in Taurus.
Beginner
Antares
Bright starA red supergiant marking the heart of Scorpius — its name means 'rival of Mars'.
Beginner
Galaxies

Andromeda Galaxy
GalaxyThe nearest large galaxy — and one of the most distant objects visible to the naked eye.
Beginner

Whirlpool Galaxy
GalaxyA face-on spiral galaxy interacting with a smaller companion.
Intermediate

Phantom Galaxy
GalaxyA famously faint face-on spiral — the classic 'photograph is much easier than eyepiece' target.
Challenging
Nebulae

Orion Nebula
NebulaThe brightest emission nebula visible from Earth — a stellar nursery in Orion's Sword.
Beginner

Ring Nebula
NebulaA tiny smoke-ring in Lyra — the classic amateur planetary nebula.
Intermediate

Dumbbell Nebula
NebulaA bright, easy planetary nebula shaped like a dumbbell or apple core.
Beginner

