Answer | Crossword Clue |
---|---|
EROS | First near-Earth asteroid to be discovered |
ceres | the first asteroid to be discovered, being the largest and one of the brightest |
EROS | First asteroid to be orbited by an artificial satellite |
EROS | First asteroid to be landed on by a spacecraft |
MIRA | First variable star to be discovered |
ARGON | First noble gas to be discovered |