Plasma — the fourth state of matter — makes up 99% of visible matter in the universe.
Fact #9035
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
Fact #1735 · Space
Cosmic rays constantly bombard Earth from space.
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The Hubble Space Telescope has captured deep images of distant galaxies.
Fact #61 · Space
Some galaxies are trillions of miles wide.
Fact #1713 · Space
Black holes can slow time so much that seconds near them equal years far away.
Fact #1790 · Space
Neutron stars are among the densest objects in the universe.
Fact #47 · Space
Time moves slower in stronger gravitational fields.
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Some stars collapse into black holes at the end of their life cycle.
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