A Harvard astronomer is suggesting that an interstellar object nearing Earth could be an engineered object — rather than a natural one — after making similar claims in in 2023 and 2017. "The ...

If it is a galaxy, it would be the oldest known galaxy in the cosmos, but it could also be a brown dwarf or an early black hole.

When the first object ever known to have visited the Earth's solar system from outer space zoomed past in 2017, it was so strange that at least one leading astronomer was convinced it was an alien ...

Flashes of light seen in the sky in old astronomical photographs may reveal the presence of reflective, satellite-like ...

The vast majority of matter is dark – invisible until it is detected only through its gravitational effects. The newly discovered object could be a clump of dark matter, or it could also be a compact, ...

NPR's Ari Shapiro talks with astronomer David Jewitt about what we can learn from the third interstellar object to have entered our solar system, a comet-like object known as 3I/ATLAS. A remarkable ...

Look around your home some time, and you'll notice yourself surrounded by objects so familiar they're more or less invisible. Your lightbulbs. Your corkscrew. Your coat hooks. Your thermostat. But ...