All thinkers

NASA Science: 3 ideas worth knowing

3 ideas from NASA Science, each explained in a minute and credited to the original work. Free on Savvy.

• A day on Venus lasts longer than a year on Venus

  A planet spins once for a day and circles the Sun once for a year. Could a single spin really take longer than the whole orbit?

  — NASA Science, Venus: Facts

• How many Earths would fit inside the Sun?

  The Sun holds more than 99% of all the mass in the solar system. If it were hollow and you poured in planets the size of ours, how many would it take to fill it?

  — NASA Science, Sun: Facts

• How many Earths could you line up between here and the Moon?

  In most diagrams the Moon hangs just off Earth's shoulder. Suppose you set Earth-sized planets side by side across the real gap. How many would fit?

  — NASA Science, Moon: Facts

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