Jun 5, 2017

Hottest planet found yet has a temperature of 7800 degrees

NASA/JPL-Caltech/R. Hurt (IPAC)

Scientists have discovered the hottest giant exoplanet yet. With a mass similar to Jupiter, the newly found planet has a temperature of about 7800 degrees Fahrenheit, hot enough to break the bonds between atoms in its atmosphere, and is bombarded by extreme-ultraviolet radiation from its host star.

Sound smart: Extreme-ultraviolet radiation is wavelengths shorter than 91.2 nanometers.

Why it matters: Thousands of planets have been observed around stars beyond our solar system, but this is just the sixth around a hot, A-type star. In this case, it's the massive KELT-9, which is almost twice as hot as our sun (at nearly 10,000 degrees Fahrenheit). Most researchers focus on searching for cooler planets that could, in theory, harbor life, but studying the hot giants will help to hone our understanding of the limits for planetary formation and evolution.

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John Kelly defends James Mattis against Trump attacks

John Kelly in the White House in July 2017. Photo: Cheriss May/NurPhoto via Getty Images

Former White House chief of staff John Kelly defended James Mattis on Thursday after President Trump attacked the former defense secretary as "the world's most overrated general" and claimed on Twitter that he was fired.

What he's saying: “The president did not fire him. He did not ask for his resignation,” Kelly told the Washington Post in an interview. “The president has clearly forgotten how it actually happened or is confused."

Barr claims "no correlation" between removing protesters and Trump's church photo op

Attorney General Bill Barr said at a press conference Thursday that there was "no correlation" between his decision to order police to forcibly remove protesters from Lafayette Park and President Trump's subsequent visit to St. John's Episcopal Church earlier this week.

Driving the news: Barr was asked to respond to comments from Defense Secretary Mark Esper, who said Tuesday that he "did not know a photo op was happening" and that he does everything he can to "try and stay out of situations that may appear political."

Updates: Cities move to end curfews for George Floyd protests

Text reading "Demilitarize the police" is projected on an army vehicle during a protest over the death of George Floyd in Washington, D.C.. early on Thursday. Photo: Yasin Ozturk/Anadolu Agency via Getty Images

Several cities are ending curfews after the protests over the death of George Floyd and other police-related killings of black people led to fewer arrests and less violence Wednesday night.

The latest: Los Angeles and Washington D.C. are the latest to end nightly curfews. Seattle Mayor Jenny Durkan tweeted Wednesday night that "peaceful protests can continue without a curfew, while San Francisco Mayor London Breed tweeted that the city's curfew would end at 5 a.m. Thursday.