The Nancy Grace Roman Space Telescope is the first NASA observatory designed for in-space refueling.

NASA’s Nancy Grace Roman Space Telescope is gliding toward its distant observation post on a pinpoint trajectory so precise that engineers estimate the spacecraft’s fuel load will last twice as long as their initial expectations, the space agency confirmed Monday.
The $4.3 billion observatory’s designers originally planned to load enough propellant into Roman’s four fuel tanks for a minimum lifetime of five years, plus a potential five-year mission extension. That was a conservative estimate. NASA officials knew an on-target launch and perfect execution of the observatory’s first post-launch course correction maneuver would leave Roman with a hearty fuel reserve.
“As a result of exquisite planning by our orbital dynamics team, brilliant execution by the operations team, and a precise launch from SpaceX, Roman has fuel for at least 22 years of potential science operations,” Jamie Dunn, center director at NASA’s Goddard Space Flight Center, said in a press release.Read full article
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Source: Ars Technica