Discover the wonders of our universe
The Sun accounts for about 99.86% of the total mass of our solar system. You could fit about 1.3 million Earths inside the Sun!
Venus rotates so slowly that a day on Venus (243 Earth days) is actually longer than a year on Venus (225 Earth days).
Since there's no wind on the Moon, the footprints left by astronauts will remain there for millions of years, unless disturbed by a meteorite impact.
Neutron stars are so dense that a teaspoon of their material would weigh about 6 billion tons on Earth. They can also spin up to 600 times per second!
Space is completely silent because there is no atmosphere for sound waves to travel through. Astronauts communicate via radio waves instead.
The largest volcano in our solar system is on Mars. Olympus Mons is about 13.6 miles high, nearly three times the height of Mount Everest.