Your gateway to the cosmos
Dive into planets, moons, stars, galaxies, black holes, and the bold missions humanity has launched into the unknown.
Pick a category and begin your journey.
Click any planet to learn more.
Over 290 moons orbit in our solar system. These are the most remarkable.
From red dwarfs to blue supergiants — stars come in extraordinary variety.
Vast islands of billions of stars. The observable universe contains at least 2 trillion.
Where gravity crushes everything beyond escape. Not even light returns.
A few of the universe's most jaw-dropping facts.
The Sun's mass
The Sun contains 99.86% of all the mass in our solar system.
Milky Way size
The Milky Way galaxy is about 100,000 light-years across.
Sagittarius A*
Our galaxy's central black hole weighs 4 million times the mass of the Sun.
Voyager 1
Launched in 1977, Voyager 1 is now over 24 billion kilometres from Earth.