NASA's James Webb telescope has discovered its first planet outside our solar system. The planet, LHS 475 b, is nearly the same size as Earth and completes an orbit around its star in two days.
In this April 13, 2017 photo provided by NASA, technicians lift the mirror of the James Webb Space Telescope using a crane at the Goddard Space Flight Center in Greenbelt, Md. The telescope is designed to peer back so far that scientists will get a glimpse of the dawn of the universe about 13.7 billion years ago and zoom in on closer cosmic objects with sharper focus.
Scientists are still trying to determine if the planet has an atmosphere. It's possible LHS 475 b has no atmosphere or one made completely out of carbon dioxide, but one option can be totally eliminated."There are some terrestrial-type atmospheres that we can rule out," said Jacob Lustig-Yaeger, a researcher at the Johns Hopkins University Applied Physics Laboratory in Marylan."It can't have a thick methane-dominated atmosphere, similar to that of Saturn's moon Titan.
Researchers were scanning the skies using NASA's Transiting Exoplanet Survey Satellite when they came across the exoplanet, and used the Webb's spectrograph technology to further investigate. Spectrographs transmit light from an object to a spectrum, which can give information about the object's temperature, mass and chemical composition.
"These first observational results from an Earth-size, rocky planet open the door to many future possibilities for studying rocky planet atmospheres with Webb," said Mark Clampin, astrophysics division director at NASA headquarters in D.C."Webb is bringing us closer and closer to a new understanding of Earth-like worlds outside our solar system, and the mission is only just getting started.
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