Redshift

A redshift is an increase in wavelength that is caused by an object moving farther away from us.

Blueshift

A blueshift is a decrease in wavelength that is caused by an object coming closer toward us.

Milky Way galaxy - facts 7

The Milky Way galaxy is expected to collide with the Andromeda Galaxy in a few billion years from now.

Milky Way galaxy - facts 6

The Milky Way galaxy is approximately 13.2 billion years old.

Milky Way galaxy - facts 5

A supermassive black hole may lie at the center of the Milky Way galaxy.

Milky Way galaxy - facts 4

There may be as many as hundreds of billions of planets in the Milky Way galaxy.

Milky Way galaxy - facts 3

The Andromeda Galaxy is the closest spiral galaxy to the Milky Way galaxy.

Milky Way galaxy - facts 2

There are hundreds of billions of stars in the Milky Way galaxy.

Milky Way galaxy - facts 1

The Milky Way galaxy is approximately 100,000 light years in diameter.

Search for extraterrestrial intelligence

You can search for extraterrestrial intelligence by using SETI@home; a free program that downloads and analyzes radio telescope data.

Phobos monolith

The Phobos monolith is a large rock on the surface of the moon Phobos. It measures approximately 280 feet across.

Mars - facts 13

The moon Phobos is larger than Deimos.