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  • Stars - NASA Science
    Astronomers call stars that are stably undergoing nuclear fusion of hydrogen into helium main sequence star s This is the longest phase of a star’s life The star’s luminosity, size, and temperature will slowly change over millions or billions of years during this phase Our Sun is roughly midway through its main sequence stage
  • Types - NASA Science
    Types of Stars The universe’s stars range in brightness, size, color, and behavior Some types change into others very quickly, while others stay relatively unchanged over trillions of years Main Sequence Stars NASA’s Solar Dynamics Observatory captured this image of our 4 6-billion-year-old Sun, a main sequence star
  • What Did Hubble See on Your Birthday? - NASA Science
    What did Hubble look at on your birthday? Enter the month and date below to find out! Then share the results with your friends on social media using #Hubble Firefox users: To easily share your birthday image on social media, you might need to turn off content blocking for this site in your browser’s privacy settings If you are using a translation-from-English feature, you may need to turn
  • Stars in an Exoplanet World - NASA Science
    Stars are the most basic building blocks of galaxies The age, distribution, and composition of stars trace the history, dynamics, and evolution of their galaxy
  • James Webb Space Telescope - NASA Science
    James Webb Space Telescope Webb is the premier observatory of the next decade, serving thousands of astronomers worldwide It studies every phase in the history of our Universe
  • Hubble Images - NASA Science
    Hubble images of the universe The page includes science images, Hubble Friday images, mission operations images, and servicing mission images
  • Star Lifecycle - NASA Science
    Young stars within a star-forming region interact with each other in complex ways The details of how they evolve and release the heavy elements they produce back into space for recycling into new generations of stars and planets remains to be determined through a combination of observation and theory
  • NASA Finds Young Stars Dim in X-rays Surprisingly Quickly
    This would lead to the stars becoming quieter in X-rays more quickly, as they age The researchers will continue to look at this and other potential causes for the rapid dimming of young Sun-like stars NASA's Marshall Space Flight Center in Huntsville, Alabama, manages the Chandra program
  • Hubble Space Telescope - NASA Science
    From the planets in our solar system to the far reaches of the cosmos, explore NASA's Hubble Space Telescope's three decades of discoveries
  • What Were the First Stars Like? - Science@NASA
    That’s it Composition of the first stars: The first generation of stars, also known as Population III stars, were made almost entirely of hydrogen and helium Later generations of stars, including the Sun, contain heavier elements like oxygen, carbon, and iron, which formed in the cores of earlier stars





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