Bright time (that is, time when the Moon is up) on the discovery telescopes could also be used for physical observations, but radar observations would presumably have to be restricted to close passages by the Earth.
(that; is; time when the Moon is up) (the Moon; is; up; T:time) (Bright time (that is, time when the Moon is up) on the discovery telescopes; could also be used; for physical observations) (radar observations; to be restricted; to close passages by the Earth)
that the Moon Bright time (that is, time when the Moon is up) on the discovery telescopes radar observations
is is could also be used to be restricted
time when the Moon is up
up T:time
for physical observations
to close passages by the Earth