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After more than 30 years of observations, Hubble 
continues to revolutionize our understanding of  

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the Universe - but what about what it hasn’t yet 
seen - most of the sky remains to be explored.

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This is where the Nancy Grace Roman Space 
Telescope comes in. Using the same sensitivity  

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and performance we've come to expect from Hubble, 
Roman will have a much larger field of view,  

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allowing us to see more of the sky at once. 
Where Webb goes deep, Roman will go big.
  

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It starts with our field of view, at any 
instant Roman will see 200x the amount of  

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sky that Hubble can see. But it’s more than 
that, Roman will move and stop and be ready  

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to take the next image very quickly.
 
To put this in context, a survey that  

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would take Roman one month, would take 
a century with Hubble. So Roman doesn’t  

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just do Hubble science faster, it can address 
entirely new, ambitious science questions. 
  

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This leads to extraordinary capabilities.
 
That one month of Roman observations could survey  

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the milky way, resulting in the detection 
of over half the stars in our galaxy. 
  

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Those 20 billion stars would represent 
a catalog of astronomical objects much  

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larger than any in existence today. Just 
with one month of Roman observations.
  

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Periodically, Roman will turn its sights towards 
the center of our galaxy and monitor 200 million  

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stars in a small patch of sky every 12 mins. But 
it won’t only image millions of stars, it will  

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discover tens of thousands of new exoplanets. 
 
To date we have found over six thousand planets  

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beyond our solar system. With Roman, 
we will find up to 40 times more.  

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Think of this as the largest census we’ve 
ever done of other planets in our galaxy. 
  

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This will not only provide critical information 
into how planets form, but it will also reveal  

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more about the different types of planets that 
exist around different stars. Such information  

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will not only help us understand the nature of 
other planets, but also of our own solar system.
  

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We’ll be able to delve deeper into the 
unknown. The physical nature of dark  

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matter and dark energy, which drive the 
evolution and future of our own Universe,  

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remain outstanding grand challenges in 
both physics and astronomy. Addressing  

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these was a prime motivation for Roman. 
We’ll do this in three different ways.
  

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Our universe is a very dynamic place that puts 
on spectacular cosmic displays every second.  

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The problem is that these events happen very 
quickly and often elude our telescopes. 
  

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With Roman’s panoramic vision, we’ll not 
only catch these events, but see many at  

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once. We’ll see 10s of thousands of 
supernovae and use these as markers  

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to track the expansion of our universe.
 
We’ll map huge swaths of the sky and find  

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billions of galaxies. We’ll measure the shapes 
of these galaxies and use this to uncover the  

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distribution of dark matter in our universe. 
 
By precisely measuring the position and distance  

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of galaxies, we’ll be able to create a 
3-D map of the Universe and watch how  

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it changes on large scales over time.

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We’ll also be able to measure how  

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our universe has expanded over time.

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These studies are even more exciting now. We  

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are seeing hints that our standard 
model of the Universe is incorrect.  

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Roman will be able to confirm this and provide 
the data needed to explore the new phenomena. 
  

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It’s really tremendously exciting - we’re likely 
to not confirm current models, but get to explore  

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entirely new phenomena for the first time. 
 
We happen to be the right mission, with the  

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right capabilities at the right time.

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Our namesake, Nancy Grace Roman, NASA’s first chief astronomer,

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would be excited not just by 
how far we have come, but by where we are going.  

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She is widely known as the mother of Hubble, 
less well known is that, in 1959, she was one  

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of the first people to suggest using a space-based 
observatory to look at planets around other stars.

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One of the most exciting things about Roman is 
the discovery potential. With 2 billion galaxies,  

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we’ll have 2000 objects that are one in 
a million. We’ll be exploring patches  

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of the sky as a function of time with 
exquisite sensitivity - we’ll find new  

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things that “go bump in the night”. The most 
exciting science from Roman will be a surprise,  

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something we couldn’t predict, that 
will set the stage for the next,  

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deeper set of questions about our 
universe for future generations to explore.

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[ NASA MEATBALL!!!! ]