The Vostok 1 mission marked the first human spaceflight.
Fact #1024
More Space Facts
Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
Fact #1782 · Space
Some pulsars emit beams of radiation like cosmic lighthouses.
Fact #1610 · Space
The surface of Venus is hidden beneath thick clouds.
Fact #1628 · Space
Some stars collapse into black holes at the end of their life cycle.
Fact #1624 · Space
Some stars explode when they die.
Fact #1717 · Space
Solar eclipses occur when the Moon blocks the Sun from Earth's view.
Fact #189 · Space
Mercury is the closest planet to the Sun.
Fact #35 · Space
Black holes can merge and release enormous energy.
Fact #1614 · Space
Want more facts?
We have over 11,491 facts across 15 categories.