Our home galaxy is a barred spiral containing an estimated 100 to 400 billion stars. It spans over 100,000 light-years across.
At the center of almost every large galaxy lies a supermassive black hole. Ours, Sagittarius A*, has a mass equal to 4 million suns.
Vast, luminous clouds of dust and gas where new stars are born. The Orion Nebula is one of the brightest and can be seen with the naked eye.
Planets that orbit stars outside our solar system. Thousands have been discovered, some uniquely rocky and potentially capable of hosting life.
An invisible form of matter making up about 27% of the universe. We can't see it, but we know it's there due to its gravitational effects on galaxies.