00:00Visit Chandra's Beautiful Universe Exoplanet Study
00:07Using NASA's Chandra X-ray Observatory and ESA's XMM-Newton, astronomers are testing how habitable exoplanets are based on whether they receive lethal radiation from the stars they orbit.
00:22This type of research will help guide observations with the next generation of telescopes aiming to make the first images of planets like Earth.
00:31A team of researchers examined stars that are close enough to Earth that telescopes set to begin operating in the next decade or two could take images of planets in their so-called habitable zones, defined as orbits where the planets could have liquid water on their surfaces.
00:46Any images of planets will be single points of light and will not directly show surface features like clouds, continents, and oceans.
00:55However, their spectra, the amount of light at different wavelengths, will reveal information about the planet's surface composition and atmosphere.
01:04There are several other factors influencing what could make a planet suitable for life as we know it.
01:09One of those factors is the amount of harmful x-rays and ultraviolet light they receive, which can damage or even strip away the planet's atmosphere.
01:17A team of astronomers began with a list of stars that are close enough to Earth that future ground and space-based telescopes could make images of planets in their habitable zone.
01:27These future telescopes include the habitable world's observatory and ground-based extremely large telescopes.
01:35Based on x-ray observations of some of these stars using data from Chandra and XMM-Newton,
01:40the researchers examined which stars could have hospitable conditions on orbiting planets for life to form and prosper.
01:47The team studied how bright the stars are in x-rays, how energetic the x-rays are, and how much and how quickly they change in x-ray output.
01:57For example, due to flares.
02:00Brighter and more energetic x-rays can cause more damage to the atmospheres of orbiting planets.
02:06They identified stars where the habitable zone's x-ray radiation environment is similar to or even milder than the one in which Earth evolved.
02:14Such conditions may play a key role in sustaining a rich atmosphere like the one found on Earth.
02:20Observing time on the next generation of telescopes will be precious and extremely difficult to obtain.
02:26These x-ray data are helping to refine and prioritize the list of targets
02:30and may allow the first image of a planet like the Earth to be obtained more quickly.
02:35Is it accurate to find that the Earth will be changing the sense that the Earth 너를arausher near the sky?
02:38You don't know, no, no, no, no, no, no.
02:39You don't know who's expected to use.
02:41You don't know what the Earth is saying...
02:43But I will not have the other Realty Dune set.
02:45You don't know how to capture the rays, but I can be able to die.
02:47That's the perfect image of the Earth.
02:49I'm not really thinking about it.
02:50I'm not really thinking about it.
02:51If I'm just thinking about it.
02:52I'm thinking about this thing.
02:53Like, I know that I'm thinking about it.
02:56I know how I'm thinking about it.
02:57You don't know who's trying to put my life in my book or a book for it.
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