When Was the First Interstellar Radio Message Sent?
The Arecibo Message, humankind’s first interstellar radio message, sent from the Arecibo Observatory in Puerto Rico in 1974, is a three-minute message of exactly…
Tag
Light-years
How Far Can You See?
How far the human eye can see depends on how many particles of light, or photons, a distant object emits. The farthest object visible with t
What Is the Milky Way Galaxy?
The Milky Way, or Galaxy, is the whole concourse of stars and other bodies which can be seen stretched across the heavens. It includes our o