However, hours later the MPC announced it was removing the object from its records because it wasn't an asteroid at all. It ...

YR4, an asteroid that currently has a more than 1 percent chance to hit the Earth in 2032, catching the attention of ...

When astronomers found a large world farther out than Pluto, it became one of the final nails in the coffin of our ninth ...

HWO will be the first space telescope built to find potentially habitable planets and analyze their atmospheres for signs of ...

A U.S. scientist searching for a civilization across 7 Earth clones circling the red dwarf star TRAPPIST-1 says its own alien ...

Nearly one third of known exoplanets are enormous gas giants, similar to Jupiter or Saturn. But whereas our solar system ...

In February 1995, a small research organization known as the SETI Institute launched what was then the most comprehensive ...

The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...