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how scientists discover distant planets : Brief Wave : NPR

April 12, 2025
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An illustration of the GAIA telescope, launched by the European Area Company (ESA) in 2013. Utilizing GAIA information, astronomers can observe a key think about exoplanet discovery: planetary wiggles.

NASA/ESA


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NASA/ESA


An illustration of the GAIA telescope, launched by the European Area Company (ESA) in 2013. Utilizing GAIA information, astronomers can observe a key think about exoplanet discovery: planetary wiggles.

NASA/ESA

Dune. Star Wars. Alien. Science fiction films love alien worlds, and so can we. However how do scientists discover planets outdoors our photo voltaic system in actual life?

Astronomers have discovered hundreds of planets outdoors our photo voltaic system: planets with super-long elliptical orbits, big planets with tiny orbits and planets that spin in the other way of their stars.

One of many strategies astronomers use to detect these planets is taking a look at a close-by star’s conduct – and seeing if it wiggles!

Why “wiggle”?

Isaac Newton’s third regulation of movement states that for each motion there may be an equal and reverse response. So, when planets really feel a gravitational pull in the direction of their suns, in addition they exert a pressure on the a lot bigger stars they orbit. These planetary tugs make the celebrities wiggle within the sky.

This motion is so small that it will probably’t be detected by human eyes or by most telescopes.

Previously, researchers have measured the pace of those wiggles through the Doppler technique, fastidiously analyzing how the star’s mild shifts. Now, scientists can observe that bodily wiggle intimately.

That is due to a brand new telescope known as GAIA, which is able to measuring the exact positions of stars — and their actions. Utilizing GAIA information, astronomers have already discovered one exoplanet, GAIA 4b.

“That is the start of the subsequent huge part of exoplanet discovery,” says Josh Winn, a professor of astronomy at Princeton College.

Winn is likely one of the astronomers who found GAIA 4b. He says analyzing extra GAIA information might yield hundreds extra exoplanets — and a greater understanding of planetary methods as an entire.

Wish to hear extra about exoplanet discoveries? Ship us an electronic mail at shortwave@npr.org.

Hearken to Brief Wave on Spotify and Apple Podcasts.

Hear to each episode of Brief Wave sponsor-free and assist our work at NPR by signing up for Brief Wave+ at plus.npr.org/shortwave.

This episode was produced by Hannah Chinn and edited by Berly McCoy. Tyler Jones checked the details. Kwesi Lee was the audio engineer.



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