Mercury has no substantial atmosphere to trap heat.
Fact #249
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There are rogue planets drifting through space with no star at all.
Fact #1781 · Space
The light you see from some stars today began traveling before humans existed.
Fact #1959 · Space
There are more stars in the universe than grains of sand on Earth.
Fact #1680 · Space
Some galaxies are trillions of miles wide.
Fact #1713 · Space
Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
Fact #1782 · Space
Jupiter has a magnetic field stronger than Earth's.
Fact #173 · Space
The Earth's magnetic field helps prevent atmospheric loss.
Fact #169 · Space
Venus has surface temperatures hot enough to melt lead.
Fact #215 · Space
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