A growing list of unexplained deaths and disappearances involving US scientists has sparked speculation, but Harvard astrophysicist Avi Loeb has urged caution, saying there is no clear evidence of a ...

Seattle-area nonprofit group kicks off a campaign to raise $15 million and solicit bids for a milestone interstellar mission.

An interstellar comet known as 3I/ATLAS, which swept past the Sun in 2024, could be a 12‑billion‑year‑old relic from deep space and has even been described by a Harvard physicist as a possible alien ...

In July 2025, astronomers detected a mysterious object entering the solar system from interstellar space. Since then, the discovery has sparked widespread interest, fueling debate over its origins and ...