Your gateway to the cosmos
Dive into planets, moons, stars, galaxies, black holes, and the bold missions humanity has launched into the unknown.
Something new from the cosmos, every single day.
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.