An interstellar cloud may have caused an ice age on Earth. Here's how
The sun protects our solar system's planets from the harsh environment of interstellar space; 2 million years ago, a dense cloud of matter could have curtailed this shielding.
The sun protects our solar system's planets from the harsh environment of interstellar space; 2 million years ago, a dense cloud of matter could have curtailed this shielding.