Dec 15, 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.

What's next

Bolton alleges in book that Trump tied Ukraine aid to investigations

Photo: Alex Wong/Getty Images

President Trump's former national security adviser John Bolton alleges in his forthcoming book that the president explicitly told him "he wanted to continue freezing $391 million in security assistance to Ukraine until officials there helped with investigations into Democrats including the Bidens," the New York Times first reported.

Why this matters: The revelations present a dramatic 11th hour turn in Trump's Senate impeachment trial. They directly contradict Trump's claim that he never tied the hold-up of Ukrainian aid to his demands for investigations into his political opponent Joe Biden.

Honoring Kobe Bryant: Sports stars, politicians and celebrities mourn NBA great

Kobe Bryant on court for the Los Angeles Lakers during the Sprite Slam Dunk Contest on All-Star Saturday Night, part of 2010 NBA All-Star Weekend at American Airlines Center in Dallas in February 2010. Photo: Jed Jacobsohn/Getty Images

Sports stars, politicians and celebrities paid tribute to NBA legend Kobe Bryant, who was killed in a California helicopter crash alongside his 13-year-old daughter, Gianna, and seven others on Saturday. He was 41.

What they're saying: Lakers great Shaquille O'Neal said in an Instagram post of his former teammate, "There's no words to express the pain I'm going through now with this tragic and sad moment of losing my friend, my brother, my partner in winning championships, my dude and my homie. I love you brother and you will be missed."

Go deeperArrow3 hours ago - Sports

What's next: Trump's broader travel ban

A sign for International Arrivals is shown at the Seattle-Tacoma International Airport. Photo: Ted S. Warren/AP

President Trump is expected to announce an expanded travel ban this week, which would restrict immigration from seven additional countries — Nigeria, Myanmar, Sudan, Belarus, Eritrea, Kyrgyzstan and Tanzania, per multiple reports.

  • The announcement would come on the third anniversary of Trump's original travel ban, which targeted Muslim-majority nations, per Axios' Stef Kight.