Scientists are grappling with a cosmic mystery: why does the Universe behave differently on massive scales compared to our ...

A giant planet circling a nearby star has given astronomers a rare look at what a colder, more Jupiter-like world can be like ...

Interstellar Comet 3I/ATLAS reveals a frozen origin older than the Sun, offering new clues about early planetary system ...

A star's mass determines its entire life story, from how it shines to how it dies. For young stars shrouded in dust, getting ...

A newly analyzed planetary system spotted by NASA’s TESS mission is challenging long-standing assumptions about how planets ...

By studying galaxy clusters separated by hundreds of millions of light-years, Penn physicist Patricio Gallardo and ...

A strange planetary system called TOI-201 is changing in real time, with three very different worlds pulling on each other.

Using NASA's exoplanet-hunting spacecraft TESS (Transiting Exoplanet Survey Satellite) and Antarctic Search for Transiting ...

A new study suggests that the comet that rambled past us from another star last year likely originated in a cold, isolated ...

From spectacular devastation to the all-too-human drama wrought by climate change, these movies and television series depicting global warming — or cooling! — have been chosen by THR staffers for ...

Rather than slowly condensing over millions of years, the first building blocks of Earth and other planets may have formed ...

It was a 2,000-year-old machine that could predict eclipses. Known as the Antikythera mechanism, the device was found in 1901 ...