A NASA poster imagines what it might be like to "planet hop" from the planet called TRAPPIST-1e, 40 light-years from Earth. NASA-JPL/Caltech hide caption

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NASA-JPL/Caltech

Led by women in pink "pussy hats," hundreds of thousands of people packed the streets of Washington and other cities in a massive outpouring of opposition to America's new president, Donald Trump. Jason Redmond/AFP/Getty Images hide caption

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Jason Redmond/AFP/Getty Images

This image made by the NASA/ESA Hubble Space Telescope shows part of a group of five galaxies known as Stephan's Quintet. NASA, ESA, Hubble SM4 ERO Team /AP hide caption

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NASA, ESA, Hubble SM4 ERO Team /AP

'Are We Alone?' Churchill Concludes It's Likely Life Circles Other Suns

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Week In Politics: Trump's Press Conference, Michael Flynn

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Vintage American history photo of a nuclear weapon test by the American military at Bikini Atoll, Micronesia on July 25, 1946. The explosion was part of Operation Crossroads. John Parrot/Stocktrek Images/Getty Images hide caption

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John Parrot/Stocktrek Images/Getty Images

Cleveland Cavaliers forward LeBron James is one of many NBA figures who's recent comments have veered into current politics. Nick Wass/AP hide caption

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Nick Wass/AP

With Politics, NBA Speaks Its Mind

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Lonely On Valentine's Day? Celebrate Love That Reaches Beyond Romance

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Syria President Bashar al-Assad in Paris in 2010. Remy De La Mauvinier /AP hide caption

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Remy De La Mauvinier /AP

Amnesty International Identifies Assad's 'Policy Of Extermination'

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Week In Politics: Appeals Court Upholds Stay On Travel Ban

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President Barack Obama speaks during the dedication ceremony for the Smithsonian Museum of African American History and Culture in Washington, DC, on Sept. 24, 2016. Pablo Martinez Monsivais/AP hide caption

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Pablo Martinez Monsivais/AP