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The team obtained the thermal emission spectrum of WASP-18 b by measuring the amount of light it emits over the Webb Telescope’s NIRISS SOSS 0.85 – 2.8 micron wavelength range, capturing 65% of the total energy emitted by the planet. WASP-18 b is so hot on the day side of this tidally locked planet that water molecules would be vaporized. Webb directly observed water vapor on the planet in even relatively small amounts, indicating the sensitivity of the observatory. Credit: NASA/JPL-Caltech (R. Hurt/IPAC)
400 light-years out there is something that is so tantalizing that astronomers have been studying it since its discovery in 2009. One orbit for WASP-18 b around its star that is slightly larger than our sun takes just 23 hours. There is nothing like it in our solar system.
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