![]() Starting at the hottest and most massive, the star classes are O, B, A, F, G (like our Sun), K, M. Our Sun’s spectrum looks like this:Īstronomers use spectra to categorize stars. Two women, Williamina Fleming and Annie Jump Cannon, created the system for classifying stars that we use today, and we’re building on their work to map out the universe.īy splitting starlight into spectra – detailed color patterns that often feature lots of dark lines – using a prism, astronomers can figure out a star’s temperature, how long it will burn, how massive it is, and even how big its habitable zone is. Studying their light in greater detail can tell us even more about what they’re like, including whether they have planets. ![]() Their colors are more than just pretty – they tell us how hot the stars are. ![]() If you’ve spent much time stargazing, you may have noticed that while most stars look white, some are reddish or bluish. Make sure to follow us on Tumblr for your regular dose of space: nasa space eclipse eclipse2017 moon earth sun orbit solarsystem science answertime alexahalfordanswertime To get more information about the eclipse, visit: She is now currently a contractor at NASA Goddard continuing work the BARREL and NASA Van Allen Probes satellite missions. She is member of the scientific team for a NASA-funded scientific balloon experiment project called BARREL (Balloon Array for RBSP Relativistic Electron Losses) where she looks at the population of particles lost due to these interactions. Her PhD thesis was on Electromagnetic Ion Cyclotron (EMIC) waves during the CRRES mission and their relationship to the plasmasphere and radiation belts. She moved away from waves to focus on geomagnetic storms and substorms during her masters at the University of Colorado Boulder with Dan Baker but returned once more to waves with her PhD at University of Newcastle NSW Australia. ![]() She started researching waves in Earth’s magnetosphere as an undergraduate at Augsburg College with Mark Engebretson using ground based magnetometers in the Arctic and Antarctic. Make sure to ask your questions now by visiting: !Īlexa Halford is a space physics researcher at our Goddard Space Flight Center and Dartmouth College. PDT. here on NASA’s Tumblr, where space physics researcher Alexa Halford will answer them. Have questions about the upcoming total solar eclipse on August 21? Join our Tumblr Answer Time session on Thursday, August 17 from 3:00 – 4:00 p.m. The total solar eclipse is coming! Here’s your chance to ask an eclipse scientist your questions! ![]()
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