![]() Type Ia supernovae are much rarer, happening roughly once every 500 years in the Milky Way. But evidence shows that type Ia supernovae originate from some binary star systems that contain at least one white dwarf – the small, hot core remnant of a Sun-like star. These supernovae occur about once every 50 years in our Milky Way galaxy. ![]() Many supernovae occur when massive stars run out of fuel, rapidly collapse under their own weight, and then explode because of strong shock waves that propel out of their interiors. One involves surveying the sky for a special type of exploding star, called a type Ia supernova. Roman will use multiple methods to investigate dark energy. One of the mission’s primary science goals involves using supernovae to help pin down the nature of dark energy – the unexplained cosmic pressure that’s speeding up the expansion of the universe. Roman’s supernova survey will help clear up clashing measurements of how fast the universe is currently expanding, and even provide a new way to probe the distribution of dark matter, which is detectable only through its gravitational effects. Roman will use type Ia supernovae to measure cosmic distances, which will help us understand how the universe has expanded over time.Ĭredit: NASA's Goddard Space Flight Center/CI Labsīroadcast-quality version of this video, as well as transcripts and still images are available for download from NASA Goddard's Scientific Visualization Studio ![]() Roman Community Forum and Mailing List Signup. ![]()
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