Scientists Discover the First Planet With a Tail

Scientists have discovered the first cometary planet, one with a huge tail, a stream of gas being ripped off by solar winds at 22,000 miles per hour. This jovian world is located 153 light-years from Earth.

The planet—called HD 209458b—orbits 100 times closer to its home star than our Jovian neighbor, traveling in an astonishingly fast 3.5-day orbit. For comparison, Mercury—our solar system fastest planet—has an 88-day orbit.

Since HD 209458b is so close to the sun, the stellar winds are ripping the planet's atmosphere apart. Scientists have used the Hubble's Cosmic Origins Spectrograph to gather evidence that support the theory that its 2,000ºF atmosphere is being ejected from its body at 22,000 miles per hour.