Artist impression of the planetary system with four planets,around a small red star,called LHS1903. Caption: Astronomers have long thought solar systems follow a simple pattern similar to our own: ...

A closer look at the planets around a star called LHS 1903 may just flip our understanding of how planetary systems form.

A distant star system with four super-sized gas giants has revealed a surprise. Thanks to JWST’s powerful vision, astronomers detected sulfur in their atmospheres — a chemical clue that they formed ...

Astronomers have found a distant world that challenges planetary formation theory, with a rocky planet where gas giants should be.

Gas giants are large planets mostly composed of helium and/or hydrogen. Although these planets have dense cores, they don't have hard surfaces. Jupiter and Saturn are the gas giants in our solar ...

We know that our Solar System is not the blueprint for all planetary systems out there. There are gas giant planets orbiting ...

An artist’s conception of the exoplanet K2-33b, a 10 Myr Jupiter-sized planet, transiting in front of its active host star. This system is comparable to those which will be observed by the KRONOS ...

The discovery provides new insights into the question, 'how large can a planet be?' An illustration of the HR 8799 system with three of its gas ...

Infant planets are ravenous little blighters that quickly devour what remains of the star-circling gas and dust clouds in which they form. The gas in these protoplanetary disks disappears rapidly, ...

How do rogue planetary-mass objects -- celestial bodies with masses between stars and planets -- form? An international team of astronomers has used advanced simulations to show that these enigmatic ...

When it comes to planets, bigger is not always easier to understand. The largest planets in the universe are gas giants—massive worlds made mostly of hydrogen and helium, with no solid surface. In our ...