But hang on. It takes a long, long time to strip a planet of hydrogen. Billions of years! So, if what these astronomers were supposing is true, maybe, just maybe, GJ 436b is still losing hydrogen now.

GJ 436b, located about 33 light-years from Earth in the constellation Leo, is a kind of world known as a warm Neptune.Such planets, at about 10 to 20 times the mass of Earth, are about the mass of ...

GJ 436b is a Neptune-sized planet orbiting a cool M dwarf star. Rather unusually, it has a large exosphere—the outer layer of the atmosphere that merges into space.

In the ultraviolet spectrum, the Neptune-mass exoplanet GJ 436b is shown to have transit depths far greater than those seen in the optical spectrum, indicating that it is surrounded and trailed by ...

GJ 436b, located about 33 light-years from Earth in the constellation Leo, is a kind of world known as a warm Neptune. Such planets, at about 10 to 20 times the mass of Earth, ...

In the case of GJ 436b, the hot Neptune, there are two possible explanations for the lack of observed features in the spectrum: either the planet has an atmosphere that's nearly devoid of hydrogen ...

GJ 436b is located 33 light-years away in the constellationLeo, the Lion. The planet rides in a tight, 2.64-day orbit around its small star,an "M-dwarf" class star that is much cooler than our sun.

Neither of the planets, GJ 436b and GJ 1214b, are quite like anything found in our solar system. GJ 436b is a warm Neptune that’s slightly larger than Neptune and much closer to its host star.

Then there's Gliese 436 b (otherwise known as GJ 436 b). This alien world is located approximately 30 light-years from Earth towards the constellation of Leo. And it is made of excruciatingly hot ice.

Observations from the Hubble Space Telescope suggest that a super-Earth and a warm Neptune-sized planet far beyond our solar system are blanketed by high-altitude clouds.

The strange, cometlike planet, known as GJ 436b, is orbiting a red dwarf star and is about 22 times as massive as Earth. Astronomers detected the giant gas cloud around the planet using NASA's ...