Nowadays everybody knows there are nine planets in our solar system, but that information was hard won.
What makes Galileo our science hero? For one thing, he moved human knowledge forward against outstanding prejudice and even persecution. Learn more on this Moment of Science.
Why does earth only have one moon, while other planets have many? Jupiter alone has nearly 40 moons! Learn more on this Moment of Science.
Ever wondered what makes up Saturn's rings? Find out on this Moment of Science.
Have astronomers found a new planet? Or is an asteroid in our midst?
This means that the ice cover contains microorganisms that date back thousands of years; recently scientists found microorganisms that froze way back when Rome was founded.