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    Connecticut museum reopens with first brontosaurus found in US

    05:20
  • Excitement grows along path of totality ahead of April 8 eclipse

    02:43
  • A modern-day woolly mammoth may be just a few years away, biotech company says

    02:49
  • Historic transplant of pig's kidney into human is successful

    01:34
  • NASA astronaut details what training is like to go to space

    06:57
  • SpaceX declares Starship launch a success

    02:21
  • Rover sends back new images from moon mission

    03:35
  • Excitement builds for April's rare total solar eclipse: How to catch it

    02:43
  • Climate change threatens winter traditions amid record-breaking temperatures

    02:00
  • Dr. Arno Penzias, who helped confirm Big Bang Theory, dies at 90

    02:01
  • Doomsday Clock stays at 90 seconds to midnight for second straight year

    01:59
  • Scientists raise alarms about controversial bite marks analysis used in convictions

    03:00
  • Meet the students using radio waves to contact the ISS

    05:57
  • NASA straps dreams of 2024 moon mission to SpaceX rockets

    02:47
  • Brain implant uses AI to give speech-disabled patients a voice

    04:31
  • NASA shares stunning photos of 'Christmas Tree Cluster' in space

    00:38
  • NASA beams cat video from deep space back to Earth using laser

    04:07
  • See images of exploding star captured by NASA’s Webb telescope

    00:31
  • Growing number of misleading ads using AI to create fake celebrity endorsements

    02:30
  • Mary Cleave, pioneering NASA astronaut, dies at 76

    02:10

Volcano in Mexico has towns on alert

00:33

Activity at Popocatepetl volcano in Mexico increased over the weekend. NBCNews.com's Dara Brown reports.