Astronomers are puzzling over a paucity of planets in the galaxy measuring between 1.5 and two times Earth’s size.
Astronomers claim in a new paper that star motions should make it easy for civilizations to spread across the galaxy, but still we might find ourselves alone.
Subatomic particles called muons are thought to have streamed through the atmosphere and irradiated megafauna like the monster shark megalodon.
Dark matter may occasionally interact with minerals in the earth, leaving telltale tracks that physicists hope to decipher.
Planetary geologist Meenakshi Wadhwa uses Martian meteorites to trace the history of our solar system.
The new finding is challenging established theories of how planets come to be.
Life needs more than water alone. Recent discoveries suggest that plate tectonics has played a critical role in nourishing life on Earth. The findings carry major consequences for the search for life elsewhere in the universe.
A series of fossil finds suggests that life on Earth started earlier than anyone thought, calling into question a widely held theory of the solar system’s beginnings.
Textbooks say that the moon was formed after a Mars-size mass smashed the young Earth. But new evidence has cast doubt on that story, leaving researchers to dream up new ways to get a giant rock into orbit.