--- title: NASA's Kepler Discovers 'Earth 2.0' | TIME description: NASA's Kepler Mission is searching for life on other planets, and it recently discovered a promising lead that's the most Earth-like yet. canonical: https://time.com/video/8nTw5Yly/ og:title: NASA's Kepler Discovers 'Earth 2.0' og:description: NASA's Kepler Mission is searching for life on other planets, and it recently discovered a promising lead that's the most Earth-like yet. og:url: https://time.com/video/8nTw5Yly/ og:image: https://cdn.jwplayer.com/v2/media/8nTw5Yly/poster.jpg?width=720 og:type: video.other twitter:card: summary_large_image twitter:title: NASA's Kepler Discovers 'Earth 2.0' twitter:description: NASA's Kepler Mission is searching for life on other planets, and it recently discovered a promising lead that's the most Earth-like yet. twitter:image: https://cdn.jwplayer.com/v2/media/8nTw5Yly/poster.jpg?width=720 --- # NASA's Kepler Discovers 'Earth 2.0' > Sponsored content. 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They are at time.com/newsletters and are separate from a paid subscription. ## Video: NASA's Kepler Discovers 'Earth 2.0' [Watch (HLS stream): NASA's Kepler Discovers 'Earth 2.0'](https://cdn.jwplayer.com/manifests/8nTw5Yly.m3u8) (1:52)  _Published 2015-07-23. NASA's Kepler Mission is searching for life on other planets, and it recently discovered a promising lead that's the most Earth-like yet._ --- Jul 27, 2023 6:35 PM UTC --- ## More From This Series [All Videos](https://time.com/video/) [New Earth-like Planets Discovered By NASA's Kepler Telescope](/video/fCApPc72/) ### New Earth-like Planets Discovered By NASA's Kepler Telescope [NASA's Next Mission](/video/kc7EDltB/) ### NASA's Next Mission [NASA's Kepler Discovers 'Habital Zone' Planet](/video/2q2RIAsT/) ### NASA's Kepler Discovers 'Habital Zone' Planet --- ## Transcript Are we alone in the universe? To answer that, NASA's Kepler space program has searched the cosmos for planets like ours. On July 23rd, they announced they discovered Earth 2. 0. They call it Kepler 452- B. It's close to the same size as Earth and revolves around a star that's roughly the same surface area as the sun, but this star is older thus 20 % brighter than the sun. And Kepler- 452b orbits it every 385 days. Now, this isn't the program's first discovery of a potentially habitable planet, but it's the most like Earth yet. It's star and our sun release the same amount of energy. And the new planet's distance from the star matches that of the Earth and the sun. All right let's get back to the basic Think of the Kepler spacecraft as a roaming telescope. Its mission is to search the Milky Way galaxy for planets one half to two times the size of Earth, revolving around their stars' habitable zones. More on that in a bit. The probe estimates a planet's size by calculating how much light is blocked from our view when it crosses its star, and the time it takes a planet to cross helps us estimate the size of its orbit. Since evolutionary theory says life on Earth Began in water. Finding oceans on other planets is the next logical step. Planet's distances from their stars have to be just right. Too close and the water is a gas. Too far and it's ice. Researchers call it the habitable zone. Or, Goldie Locks zone. In 2011 the Kepler mission confirmed it's first potentially habitable planet. Revolving around a star, similar to the Sun, at the perfect distance for liquid water. But, having the potential for life doesn't mean A planet does, mainly because liquid water isn't the only thing needed for life. Space. com's recipe for a habitable planet gives us a good idea of the delicate balance of what's required, so you can see why Kepler's new findings are so exciting. 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