00:00Astronomers have discovered a massive exoplanet with a huge, comet-like tail.
00:06The planet is called WASP69b, a gas giant similar in size to Jupiter.
00:15This planet is located about 160 lighters away from Earth.
00:21WASP69b is leaving behind a tail of gas that stretches nearly 350,000 miles.
00:29The tail is about seven times longer than the planet's own radius.
00:34Scientists believe this tail is made from the planet's escaping atmosphere.
00:39WASP69b orbits extremely close to its parent star.
00:46Because of this closeness, powerful stellar winds hit the planet constantly.
00:52These stellar winds are stripping hydrogen and helium from the planet's atmosphere.
00:57The escaping gas forms a long, glowing trail behind the planet.
01:03Earlier studies suggested only weak atmospheric loss or no visible tail.
01:08New observations have now clearly confirmed the existence of this massive tail.
01:14The discovery was led by researchers from UCLA.
01:18Observations were made using the 10-meter Keck telescope in Hawaii.
01:22Scientists used a high-resolution spectrograph to study light changes.
01:28This allowed them to track the motion and composition of the escaping gas.
01:33The team observed how the gas interacts with the star's radiation.
01:37WASP69b is classified as a hot Jupiter exoplanet.
01:43It completes one full orbit around its star in less than four Earth days.
01:48This system allows scientists to study atmospheric loss in real time.
01:53Most exoplanets lost their atmospheres long ago.
01:56WASP69b is special because this process is still happening.
02:02Despite losing gas, the planet is not in danger of disappearing.
02:08WASP69b is about 90 times more massive than Earth.
02:16It has a huge reserve of atmospheric material.
02:20The star will die before the planet loses all its atmosphere.
02:24This discovery helps scientists understand how planets evolve.
02:28It also explains how stars affect nearby planets.
02:32Even after 10 years, WASP69b still holds many secrets.
02:41The research has been published in the Astrophysical Journal.
02:44Theicoid Journal
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