A string of benzene molecules that's 20,000 times smaller than a strand of human hair is the strongest material ever made.
It's hard work to be in space for months at a time. Read about the record-holders for America's single spaceflights -- including Scott Kelly, who just recently surpassed the previous mark of 215 days.
After 15 years of a continuous crewed presence, here are just a few of the highs and lows of humanity's most ambitious international endeavor in space.
Scientists are taking initial steps in a long-term effort to learn as much as they can about gravitational waves -- mysterious undulations in the fabric of space-time that have so far evaded clear detection.
It could be that the plucky rovers we've sent to explore the Red Planet have brought with them unwelcome, hitchhiking bacteria.
Is a lunar space port a viable stepping stone to Mars?
The first astronauts on the Moon were global celebrities of their day, their missions lionized. How will the public feel about a Red Planet we can't really even see in our night sky?
The chosen site, Oxia Planum, is laced with tantalizing chemical fingerprints of clays and other minerals.
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