From studying rocks, fossils, and Antarctic ice, scientists think the Sun has been brightening over time, but only slightly.
(scientists; think; the Sun has been brightening over time) Context(scientists think,List([49, 65))):(the Sun; has been brightening; T:over time)
scientists think,List([49, 65))
scientists the Sun
think has been brightening
the Sun has been brightening over time
T:over time