Part of the story is everyone being shocked at being under budget and ahead of schedule. I don't know everything, but I think this is reasonably attributable to the fact that this is a retrofit of an obsolete spy satellite. The leftovers of the security sector will be the most advanced scientific space surveyor. I have to wonder what things would look like with different priorities.
For some tasks, surveys in particular, field of view is critical. You would need many Hubble telescopes to do what Roman can do mapping everything out there.
"What really makes Roman stand out is that it is designed for wide-field imaging. The cameras on telescopes can often only detect objects in a very small patch of sky. If we use the size that the full moon appears in the sky as our guide, Hubble’s field of view is often smaller than that —meaning each picture it takes is of a patch of sky smaller than the full moon. Webb’s instruments often are even smaller than Hubble’s. Each picture taken by Roman, however, will be larger than the full moon, allowing it to survey more of the sky much faster than Hubble or Webb."
Hubble in certain circumstances can see narrow and far. If you express this as a cone, you can extrapolate a volume.
It might be very useful to have something that can search wide and maybe not as far; nearer Earth dangers perhaps. Express that as a wider cone and extrapolate volume.
I'm wondering what are the considerations for having multiple detectors instead of a single large one! Does anybody have an idea? is it just because it's easier?
This video linked from the site is quite good at adding a sense of scale to the undertaking. I also love that Roman will be supported by Hubble and Webb.
did not know and it's horrific Roman started as a billion dollar spy satellite sitting in a warehouse unused, but okay we got the crumbs from $20 Trillion in military spending I guess
oh and while the smallest planet Roman can image will be Jupiter-sized, Roman's successor would be able to image earth-like planets
except The Habitale Worlds Observatory Space Telescope HWO was scheduled for 2040 and now will not happen in my lifetime because DOGE got that one, Congress awarded it $150 Million and DOGE changed it to $5 Million
Is it really 500 Mbps of data headed to Earth 24x7? I'd be very interested to see any available public info about the earth station infrastructure being set up for that.
> except The Habitale Worlds Observatory Space Telescope HWO was scheduled for 2040 and now will not happen in my lifetime because DOGE got that one, Congress awarded it $150 Million and DOGE changed it to $5 Million
I was so excited for this. It was the one thing I really wanted to see happen in my own lifetime.
The NASA budget was $5M as a placeholder, but Noel Hinners cut it to zero to light a fire under the community, instead of a bogus pretend-its-still-happening number.
"mbps" is a meaningless abbreviation. You need to consistently and correctly use capital letters when communicating technical terms. You cannot "e e cummings" your way into effective writing.
500 megabits per second works out to 5.4 terabytes per day. No idea where you get 1.5, unless you were thinking of 500Mb/hour!
The GP is alluding to the fact that the prefix "m" means milli-, not mega-. But that's pointless pedantry. Nobody would ever think that you meant 0.5 bits per second, and bit isn't a SI unit anyway.
No, your cable modem would be 1.08 terabytes per day.
Does it stop making sense when your calculations for the Roman telescope indicate slower speeds than your connection, which you say is 1/5th the speed?
Now, since the Roman telescope will be at an L2 point, signal acquisition will always be subject to the Earth's rotation. So there will be multiple ground stations involved across the globe.
If the quoted rate by NASA of 1.5 terabytes per day is accurate, then it will not be downlinking 24/7, but in bursts. 500Mbps is also the max, where the actual range will be 250-500. We'll need to account for RFI and packet loss, etc.
Part of the story is everyone being shocked at being under budget and ahead of schedule. I don't know everything, but I think this is reasonably attributable to the fact that this is a retrofit of an obsolete spy satellite. The leftovers of the security sector will be the most advanced scientific space surveyor. I have to wonder what things would look like with different priorities.
IIRC the mirror is from a spy satellite, but the chassis and electronics are all NASA.
People shouldn't be shocked that employees of the US government can deliver things ahead of schedule and under budget.
The problems are that anyone gave Musk/doge the time of day and that we're too used to the president giving no bid contacts to incompetent donors.
> the president giving no bid contacts to incompetent donors
Are you talking about SLS?
Oh maybe you'd say that is "Senate Launch System", it's complicated, job program, 50 states sharing, and so on?
Roman is scheduled to launch tomorrow (Aug 30) on a Falcon Heavy rocket:
https://www.space.com/news/live/nancy-grace-roman-telescope-...
For some tasks, surveys in particular, field of view is critical. You would need many Hubble telescopes to do what Roman can do mapping everything out there.
"What really makes Roman stand out is that it is designed for wide-field imaging. The cameras on telescopes can often only detect objects in a very small patch of sky. If we use the size that the full moon appears in the sky as our guide, Hubble’s field of view is often smaller than that —meaning each picture it takes is of a patch of sky smaller than the full moon. Webb’s instruments often are even smaller than Hubble’s. Each picture taken by Roman, however, will be larger than the full moon, allowing it to survey more of the sky much faster than Hubble or Webb."
https://science.psu.edu/news/ask-expert-will-roman-help-reve...
And yet the narrow-field Hubble produced this famous image
https://science.nasa.gov/mission/hubble/science/universe-unc...
Those are galaxies. In a field of view "about 1/13th the diameter of the full Moon."
Your point being?
Hubble in certain circumstances can see narrow and far. If you express this as a cone, you can extrapolate a volume.
It might be very useful to have something that can search wide and maybe not as far; nearer Earth dangers perhaps. Express that as a wider cone and extrapolate volume.
I think their point is that it’s amazing.
I'm wondering what are the considerations for having multiple detectors instead of a single large one! Does anybody have an idea? is it just because it's easier?
This video linked from the site is quite good at adding a sense of scale to the undertaking. I also love that Roman will be supported by Hubble and Webb.
https://www.youtube.com/watch?v=CDwemQH2zDU
Thankfully, it is not Nancy Ann Grace.
The telescope will be used to film sensationalist TV about missing kids
I was scared for a second that the current clown administration had named a space telescope after Nancy Grace the tv personality.
I suppose we should be grateful he didn’t force his own name at the last minute. I suppose he still has time.
I'm still holding my breath on this one, will be most amazing telescope in my lifetime
parked in L2 a million miles away with 500mbps data transfer rate (1.5TB per DAY)
we've made it past DOGE destroying it
we've made it past him renaming it after himself and putting his mugshot on it
but Musk still needs to send it out of orbit without explosions, so here's hoping
(Falcon Heavy, don't tell me the odds)
* https://nextspaceflight.com/launches/details/6983/
* JWST vs Roman comparison https://svs.gsfc.nasa.gov/14942/
* https://www.wired.com/story/nasas-nancy-grace-roman-space-te...
* https://www.scientificamerican.com/article/nasas-roman-space...
* https://www.npr.org/2026/08/28/nx-s1-5905370/nasa-nancy-grac...
did not know and it's horrific Roman started as a billion dollar spy satellite sitting in a warehouse unused, but okay we got the crumbs from $20 Trillion in military spending I guess
oh and while the smallest planet Roman can image will be Jupiter-sized, Roman's successor would be able to image earth-like planets
except The Habitale Worlds Observatory Space Telescope HWO was scheduled for 2040 and now will not happen in my lifetime because DOGE got that one, Congress awarded it $150 Million and DOGE changed it to $5 Million
* https://science.nasa.gov/astrophysics/programs/habitable-wor...
* https://en.wikipedia.org/wiki/Habitable_Worlds_Observatory
Is it really 500 Mbps of data headed to Earth 24x7? I'd be very interested to see any available public info about the earth station infrastructure being set up for that.
> except The Habitale Worlds Observatory Space Telescope HWO was scheduled for 2040 and now will not happen in my lifetime because DOGE got that one, Congress awarded it $150 Million and DOGE changed it to $5 Million
I was so excited for this. It was the one thing I really wanted to see happen in my own lifetime.
What a deeply moronic waste.
That's like Hubble funding cuts back in the '70s.
The NASA budget was $5M as a placeholder, but Noel Hinners cut it to zero to light a fire under the community, instead of a bogus pretend-its-still-happening number.
https://en.wikipedia.org/wiki/Hubble_Space_Telescope#Quest_f...
It is not 500mbps but 500Mbps. https://science.nasa.gov/mission/roman-space-telescope/commu...
"mbps" is a meaningless abbreviation. You need to consistently and correctly use capital letters when communicating technical terms. You cannot "e e cummings" your way into effective writing.
500 megabits per second works out to 5.4 terabytes per day. No idea where you get 1.5, unless you were thinking of 500Mb/hour!
60 × 60 × 24 × 500 × 1000000 ÷ 8
my brain is not what it used to be due to long-covid so it's very possible I made a mistake
but 500 megabits per second to me is 500mbps?
ie. my cablemodem is 100mbps which is 100 megabits per second?
and that would [make Roman] 5.4 Terrabytes aka 5.4TB per day
but the transmitter is not at full speed full power 24/7
so it is 1.5TB per day in documentation that I do not have handy but vaguely remember
to repeat the more amazing part is that is from a MILLION MILES away, wow
(JWST "only" does 23mbps, 23 megabits per second)
The GP is alluding to the fact that the prefix "m" means milli-, not mega-. But that's pointless pedantry. Nobody would ever think that you meant 0.5 bits per second, and bit isn't a SI unit anyway.
No, your cable modem would be 1.08 terabytes per day.
Does it stop making sense when your calculations for the Roman telescope indicate slower speeds than your connection, which you say is 1/5th the speed?
Now, since the Roman telescope will be at an L2 point, signal acquisition will always be subject to the Earth's rotation. So there will be multiple ground stations involved across the globe.
https://en.wikipedia.org/wiki/NASA_Deep_Space_Network
If the quoted rate by NASA of 1.5 terabytes per day is accurate, then it will not be downlinking 24/7, but in bursts. 500Mbps is also the max, where the actual range will be 250-500. We'll need to account for RFI and packet loss, etc.