Some galaxies are trillions of miles wide.
Fact #1713
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Solar eclipses occur when the Moon blocks the Sun from Earth's view.
Fact #189 · Space
The Bell Labs experiment led to the discovery of the cosmic microwave background.
Fact #1021 · Space
Cosmic microwave background radiation is evidence of the early universe.
Fact #1608 · Space
Black holes can slow time so much that seconds near them equal years far away.
Fact #1850 · Space
The universe is expanding faster.
Fact #1708 · Space
The observable universe is about 93 billion light‑years wide.
Fact #1819 · Space
Black holes can slow time so much that seconds near them equal years far away.
Fact #1729 · Space
Mercury is the closest planet to the Sun.
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