1 00:00:00,000 --> 00:00:10,916 The Hubble Space Telescope has embarked on the largest observing program of its career. 2 00:00:10,916 --> 00:00:20,464 Over the next couple years, Hubble will study hundreds of stars in ultraviolet (UV) light. 3 00:00:20,464 --> 00:00:30,000 Many young stars and massive stars are bright in UV light. 4 00:00:30,000 --> 00:00:39,265 But Earth’s atmosphere absorbs most UV light. So to study it in-depth, you need a space telescope. 5 00:00:39,265 --> 00:00:51,831 Hubble is the only active mission with a large mirror and ultraviolet detectors. 6 00:00:51,831 --> 00:01:04,699 Astronomers wanted to use these unique UV capabilities before Hubble’s mission ultimately ends. 7 00:01:04,699 --> 00:01:11,429 And that’s where the ULLYSES project comes in… 8 00:01:11,429 --> 00:01:23,291 The Ultraviolet Legacy Library of Young Stars as Essential Standards 9 00:01:23,292 --> 00:01:36,462 ULLYSES will create a library of valuable spectra of many different stars. 10 00:01:36,462 --> 00:01:51,946 A star’s spectrum reveals its composition, temperature, density, velocity and more. 11 00:01:51,946 --> 00:02:01,091 ULLYSES targets young, low-mass stars in our galaxy as well as massive stars in four nearby galaxies. 12 00:02:01,091 --> 00:02:16,474 The radiation from massive stars affects the evolution of entire star-forming regions and their home galaxies... 13 00:02:16,474 --> 00:02:26,487 ...while observing the young, low-mass stars helps us understand their adolescent stages. 14 00:02:26,487 --> 00:02:40,059 These low-mass studies will help show us what our own Sun was doing in the first few million years after it formed. 15 00:02:40,059 --> 00:02:51,059 Hubble will spend more time on this Program than any other in its history... 16 00:02:51,059 --> 00:03:03,619 ...and as Hubble’s observations are completed, they will immediately become available to the public. 17 00:03:03,619 --> 00:03:16,084 ULLYSES will give astronomers an incredible library of stars to explore for decades to come! 18 00:03:16,085 --> 00:03:23,357 [ INTENSE MUSIC ]