LAVA PLANET Ou Open the Door of Your Spacecraft and Step out at the Edge of an Ocean

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BY STEPHANIE WARREN LAVA PLANET ou open the door of your spacecraft and step out at the edge of an ocean. It’s not a normal seashore. The ocean at your feet is made of lava. You’re on Ya planet 489 light-years (the distance light travels in one year) from Earth, far outside your solar system. To explore this lava planet, named CoRoT-7b, you wear a heatproof spacesuit. It’s 3,990°F here—hot enough to vaporize a human. Like Earth, CoRoT-7b is made largely of rock. But the lava planet is much closer to its sun than Earth is, making the planet hot enough to melt rock. This liquid rock forms a red-orange lava ocean that covers almost half the planet. The intense heat vaporizes the liquid rock, turning it into rock gas. The rock gas rises above the ocean and forms clouds, just as water does on Earth. As you stare into the sky, squinting against the bright sunlight, you see clouds gathering and moving toward you. Suddenly you hear the plop of a pebble falling from the cloudy sky into the lava ocean at your feet. Then pebbles fall all around you—the gas rock condensed and now it’s raining rocks! You jump inside your spacecraft. Rocks crash into your windshield. You speed away from this extreme planet—clearly it’s no place for a vacation! Destination The planet CoRoT-7b Location The constellation Monoceros Distance 489 light-years from Earth Scientists have discovered Time to reach three other 13.3 million years lava planets like Weather CoRoT-7b. Sunny and 3,990°F with a chance of rock rain Half the planet always The lava faces its sun. ocean on CoRoT-7b is 28 Half the miles deep. planet always faces away from its sun. EYE April 21-22: Watch the night sky for the Lyrids meteor April 28: Saturn will be very close to Earth. ON THE shower. Sometimes called shooting stars, meteors are This is the best time to see Saturn’s rings SKY space rocks that burn up in Earth’s atmosphere. and moons through a telescope. MONDOLITHIC (BOTH) NATIONAL GEOGRAPHIC KIDS 7 Apr 2013 NG Kids-Space-2nd OUT.indd 7 2/7/13 3:27 PM.

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Arxiv:2008.02789V1 [Astro-Ph.EP] 6 Aug 2020 Common Planet Size; and Compact Multiple Planet Sys- Tems
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