The Oort Cloud, a vast reservoir of comets at the edge of the solar system, has never been directly observed.
Fact #4563
👍 0 · 👎 0
More Space Facts
The Space Race led to the Apollo 11 Moon landing in 1969.
Fact #1118 · Space
The Milky Way and Andromeda galaxies are on a slow collision course.
Fact #1613 · Space
Time moves slower in gravity.
Fact #1721 · Space
There are more trees than stars in our galaxy.
Fact #1703 · Space
Project Mercury was the first U.S. human spaceflight program.
Fact #1074 · Space
A day on Venus is longer than its year.
Fact #1684 · Space
Black holes can bend light through gravitational lensing.
Fact #1598 · Space
Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
Fact #1848 · Space
Want more facts?
We have over 11,491 facts across 16 categories.