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    "segs": [ {
      "utf8": "Observatories like the Webb and Hubble space telescopes"
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      "utf8": "are transforming our \nunderstanding of the universe."
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      "utf8": "They have revealed\nthat black holes are common,"
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      "utf8": "helped measure\nthe age of the cosmos,  "
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      "utf8": "and even played a key role\nin one of astronomy's"
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    "segs": [ {
      "utf8": "greatest surprises:\nthe discovery that the  "
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    "dDurationMs": 4872,
    "segs": [ {
      "utf8": "driven by an unknown force\nwe simply call “Dark Energy.”"
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    "segs": [ {
      "utf8": "But some of the biggest questions \nin science remain unanswered. "
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    "segs": [ {
      "utf8": "What actually IS dark energy? \nWhat is dark matter?"
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    "segs": [ {
      "utf8": "How common are\nplanetary systems like our own?"
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    "segs": [ {
      "utf8": "And how did the universe evolve  "
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    "segs": [ {
      "utf8": "from the first isolated galaxies \ninto the cosmic web we see today? "
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    "segs": [ {
      "utf8": "NASA's Nancy Grace\nRoman Space Telescope"
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      "utf8": "is designed to help\nanswer those questions. "
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    "segs": [ {
      "utf8": "Roman will carry a mirror the same \nsize as Hubble's, 2.4 meters across,  "
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    "segs": [ {
      "utf8": "but its true power comes\nfrom something entirely different:"
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    "segs": [ {
      "utf8": "Its Wide Field Instrument will allow  "
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    "segs": [ {
      "utf8": "Roman to see enormous\nportions of the sky at once."
    } ]
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      "utf8": "A single Roman\nimage will capture an  "
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    "segs": [ {
      "utf8": "area a hundred times larger than Hubble’s or Webb’s infrared views,"
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    "tStartMs": 75008,
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    "segs": [ {
      "utf8": "while still delivering high-resolution\nand sensitive observations."
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    "segs": [ {
      "utf8": "Roman does this with\na unique array of 18 4k detectors. "
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    "segs": [ {
      "utf8": "They are arranged in\nan arc to make full use"
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  }, {
    "tStartMs": 88455,
    "dDurationMs": 3637,
    "segs": [ {
      "utf8": "of the optical system’s region\nof best image quality. "
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  }, {
    "tStartMs": 92092,
    "dDurationMs": 4304,
    "segs": [ {
      "utf8": "Combined, they form\na 300 megapixel image. "
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  }, {
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    "dDurationMs": 4805,
    "segs": [ {
      "utf8": "That combination of power and \nscale changes what is possible. "
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    "segs": [ {
      "utf8": "Instead of studying\na few objects at a time,"
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    "segs": [ {
      "utf8": "Roman will survey vast regions\nof the universe."
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      "utf8": "During its first five years,"
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    "segs": [ {
      "utf8": "it is expected to observe\nmore than a billion galaxies"
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  }, {
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    "dDurationMs": 2269,
    "segs": [ {
      "utf8": "and collect data that would take centuries"
    } ]
  }, {
    "tStartMs": 115615,
    "dDurationMs": 2536,
    "segs": [ {
      "utf8": "for other observatories to gather."
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    "segs": [ {
      "utf8": "One of Roman's primary goals \nis investigating dark energy. "
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    "segs": [ {
      "utf8": "More than a century ago,\nAlbert Einstein's equations"
    } ]
  }, {
    "tStartMs": 126459,
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    "segs": [ {
      "utf8": "suggested the universe should\neither expand or contract."
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    "dDurationMs": 4204,
    "segs": [ {
      "utf8": "In 1929, Edwin Hubble confirmed that galaxies are moving  "
    } ]
  }, {
    "tStartMs": 134467,
    "dDurationMs": 4638,
    "segs": [ {
      "utf8": "away from one another, showing \nthat the universe is expanding. "
    } ]
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    "segs": [ {
      "utf8": "For decades,\nastronomers assumed gravity"
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    "segs": [ {
      "utf8": "would gradually slow that expansion. "
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    "segs": [ {
      "utf8": "Then, in 1998, observations of distant"
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  }, {
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    "dDurationMs": 3370,
    "segs": [ {
      "utf8": "exploding stars revealed\nsomething unexpected:  "
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      "utf8": "The expansion of\nthe universe is speeding up."
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  }, {
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    "dDurationMs": 4037,
    "segs": [ {
      "utf8": "Something appears to be\npushing the cosmos apart. "
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    "segs": [ {
      "utf8": "Scientists call that unknown \ninfluence dark energy. "
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    "segs": [ {
      "utf8": "68 percent of the universe,  "
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    "segs": [ {
      "utf8": "yet its true nature remains one of \nthe greatest mysteries in physics. "
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      "utf8": "Roman will approach\nthis problem using"
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    "segs": [ {
      "utf8": "It will map the positions of millions of galaxies in three dimensions,"
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    "tStartMs": 182282,
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      "utf8": "study distant supernova explosions,  "
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  }, {
    "tStartMs": 184951,
    "dDurationMs": 2703,
    "segs": [ {
      "utf8": "and measure how light bends through a phenomenon"
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  }, {
    "tStartMs": 187654,
    "dDurationMs": 3136,
    "segs": [ {
      "utf8": "known as gravitational lensing. "
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      "utf8": "Together, these observations\nwill allow scientists"
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  }, {
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    "segs": [ {
      "utf8": "to trace how the universe\nhas changed over  "
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    "dDurationMs": 3137,
    "segs": [ {
      "utf8": "billions of years and\ntest whether dark energy"
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      "utf8": "Roman will also help illuminate \nanother cosmic mystery: dark matter. "
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      "utf8": "Although invisible,\ndark matter exerts a"
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    "segs": [ {
      "utf8": "gravitational pull and\nappears to make up most  "
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    "tStartMs": 214380,
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    "segs": [ {
      "utf8": "of the matter the universe is made of."
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  }, {
    "tStartMs": 216916,
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      "utf8": "Astronomers can infer its presence"
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    "segs": [ {
      "utf8": "because galaxies and \ngalaxy clusters behave as though"
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  }, {
    "tStartMs": 222589,
    "dDurationMs": 3169,
    "segs": [ {
      "utf8": "they contain far more\nmass than we can see."
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  }, {
    "tStartMs": 225758,
    "dDurationMs": 2636,
    "segs": [ {
      "utf8": "Something is there. "
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    "segs": [ {
      "utf8": "Roman will map both\nvisible matter and dark matter"
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    "tStartMs": 231397,
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    "segs": [ {
      "utf8": "across enormous stretches of space  "
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    "tStartMs": 233499,
    "dDurationMs": 4572,
    "segs": [ {
      "utf8": "by measuring small changes in the shapes of distant galaxies."
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      "utf8": "These measurements\nwill provide one of"
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    "dDurationMs": 1635,
    "segs": [ {
      "utf8": "of how matter is distributed  "
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      "utf8": "throughout the cosmos\nand how large objects"
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      "utf8": "Closer to home,\nRoman will also conduct"
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      "utf8": "one of the most\nambitious searches for  "
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    "tStartMs": 254554,
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  }, {
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      "utf8": "have been found\nusing the transit method,"
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    "segs": [ {
      "utf8": "which detects tiny dips\nin starlight when a  "
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      "utf8": "planet crosses in front of its host star."
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      "utf8": "Roman will complement\nthose discoveries  "
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    "tStartMs": 270637,
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    "segs": [ {
      "utf8": "by primarily using a technique \ncalled gravitational microlensing. "
    } ]
  }, {
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    "segs": [ {
      "utf8": "When a star passes in front of a \nmore distant star, gravity bends  "
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    "segs": [ {
      "utf8": "and magnifies the\nbackground starlight."
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    "segs": [ {
      "utf8": "If a planet is orbiting\nthe foreground star, it  "
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  }, {
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    "segs": [ {
      "utf8": "leaves a distinctive\nfingerprint in that signal."
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  }, {
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    "segs": [ {
      "utf8": "By continuously\nmonitoring millions of stars in  "
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  }, {
    "tStartMs": 291991,
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    "segs": [ {
      "utf8": "the crowded center of the Milky Way,"
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      "utf8": "Roman is expected to discover thousands of new worlds,  "
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      "utf8": "including planets smaller than Mars,"
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      "utf8": "planets orbiting far from their stars,"
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  }, {
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    "segs": [ {
      "utf8": "and even rogue planets\ndrifting freely through space."
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      "utf8": "These discoveries will help astronomers  "
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      "utf8": "a technology demonstration\ndesigned to block  "
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      "utf8": "the overwhelming\nglare of nearby stars."
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    "segs": [ {
      "utf8": "This will allow astronomers\nto directly image giant  "
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  }, {
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    "segs": [ {
      "utf8": "exoplanets and dusty disks\naround neighboring stars,"
    } ]
  }, {
    "tStartMs": 330897,
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    "segs": [ {
      "utf8": "helping pave the way\ntoward future missions  "
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    "tStartMs": 333433,
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      "utf8": "capable of finding Earth-like worlds."
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      "utf8": "Beyond its primary investigations,  "
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      "utf8": "Roman's vast surveys will become \na treasure trove for astronomy."
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    "segs": [ {
      "utf8": "some of the earliest\ngalaxies in the universe,  "
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  }, {
    "tStartMs": 349182,
    "dDurationMs": 4437,
    "segs": [ {
      "utf8": "uncover distant quasars powered\nby supermassive black holes, "
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    "tStartMs": 353619,
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    "segs": [ {
      "utf8": "reveal streams of stars\nswirling into nearby galaxies,"
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      "utf8": "and provide an unprecedented\nmap of the cosmos"
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    "tStartMs": 361294,
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      "utf8": "stretching back to when the universe was only a fraction of its current age."
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      "utf8": "Many of the most important discoveries may be  "
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    "tStartMs": 369202,
    "dDurationMs": 3470,
    "segs": [ {
      "utf8": "things astronomers aren't\neven expecting to find."
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      "utf8": "That's because Roman\nis designed not just to  "
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    "segs": [ {
      "utf8": "study individual objects, but \nto reveal the bigger picture. "
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      "utf8": "The phenomena Roman will detect\nin its wide field images"
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    "tStartMs": 383116,
    "dDurationMs": 1901,
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      "utf8": "will be followed up with detailed,  "
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    "tStartMs": 385017,
    "dDurationMs": 2770,
    "segs": [ {
      "utf8": "higher resolution studies\nby Hubble and Webb,"
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    "tStartMs": 387787,
    "dDurationMs": 1868,
    "segs": [ {
      "utf8": "which together cover wavelengths of  "
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    "tStartMs": 389655,
    "dDurationMs": 3671,
    "segs": [ {
      "utf8": "light ranging from ultraviolet to mid-infrared."
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      "utf8": "Along with observatories like Hubble, Webb,"
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    "segs": [ {
      "utf8": "ESA’s Euclid mission, and\nthe Vera C. Rubin Observatory,"
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  }, {
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    "dDurationMs": 3103,
    "segs": [ {
      "utf8": "Roman will usher in\na new era of discovery,  "
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    "tStartMs": 403436,
    "dDurationMs": 3470,
    "segs": [ {
      "utf8": "giving scientists an unprecedented\nview of the universe"
    } ]
  }, {
    "tStartMs": 406906,
    "dDurationMs": 2269,
    "segs": [ {
      "utf8": "and bringing us closer\nto answering some  "
    } ]
  }, {
    "tStartMs": 409175,
    "dDurationMs": 2869,
    "segs": [ {
      "utf8": "of humanity's oldest questions..."
    } ]
  }, {
    "tStartMs": 412044,
    "dDurationMs": 2737,
    "segs": [ {
      "utf8": "What is the universe made of? "
    } ]
  }, {
    "tStartMs": 414781,
    "dDurationMs": 2535,
    "segs": [ {
      "utf8": "How did it become\nwhat we see today?"
    } ]
  }, {
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    "dDurationMs": 2670,
    "segs": [ {
      "utf8": "And what will its ultimate fate be? "
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      "utf8": "The Nancy Grace\nRoman Space Telescope"
    } ]
  }, {
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    "dDurationMs": 3303,
    "segs": [ {
      "utf8": "was built to help us find out."
    } ]
  }, {
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    "dDurationMs": 6340,
    "segs": [ {
      "utf8": "[ NASA MEATBALL!!!!! ]"
    } ]
  } ]
}