about the same time as the European Space Agency's Euclid. In addition, the availability of a telescope is believed to increase the probability that the mission will be launched at all. While the first telescope is now in use as the basis for Roman/WFIRST, NASA currently does not have plans or funding for the usage of the second. Astronomers had studied possible additional uses, and NASA considered dozens of proposals; the only prohibition is Earth observation, a condition of the NRO donation. Possibilities include observing Earth's aurora and ionosphere, or asteroids and other faint objects within the solar system. NASA has also suggested that the telescope could be sent to Mars, photographing the surface with a resolution about four times finer than the current Mars Reconnaissance Orbiter's HiRISE instrument. From Martian orbit the telescope could also view the outer Solar System and the asteroid belt. See also Multiple Mirror Telescope - an astronomical telescope in Arizona, built with donated NRO mirrors References Space telescopes National Reconnaissance Office NASA 2012 in the United States