10 Unsolved Space Mysteries

The Dark Matter Mystery

Dark matter is an invisible substance that makes up most of the universe's mass. 

The Great Attractor

The Great Attractor is a mysterious region of space that seems to be pulling galaxies towards it. 

The Wow! Signal

In 1977, a radio signal was detected from space that was so unusual it was named the Wow! Signal.

The Pioneer Anomaly

The Pioneer spacecraft, launched in the 1970s, experienced an unexplained deviation from its predicted path.

The Kuiper Belt Mystery

The Kuiper Belt is a region of space beyond Neptune that contains thousands of icy objects. 

The Lunar Swirls Enigma

Lunar swirls are bright and sinuous features on the moon's surface that are still a mystery. 

The Tunguska Event

In 1908, a massive explosion occurred over a remote region in Russia known as the Tunguska Event.

The Great Silence

The Fermi Paradox asks the question: if the universe is teeming with intelligent life, why haven't we heard from them yet?

The Black Hole Information Paradox

The Black Hole Information Paradox is the question of what happens to the information that enters a black hole.

The Cosmic Microwave Background Radiation

The Cosmic Microwave Background Radiation is the afterglow of the Big Bang.