Somewhere out there, a planet roughly the size of Earth may be orbiting a distant star in conditions that could support life. The problem is not finding the star.

Bill Maher urged U.S. President Donald Trump to "stop being funny" as he accepted the Mark Twain Prize for American Humor on ...

如果你现在放眼欧洲西部，就会发现很难找到能够避开高温的地区。 European farmers are still counting the cost of last year's drought, which saw plummetin ...