How the Kepler Telescope Works
Up next
Recommended Episodes
Since the Kepler telescope went online, astronomers have found there may be an estimate 40 billion planets like Earth in the Milky Way galaxy alone. What does it take for a planet to be considered Earth-like?
Astronauts left over a hundred items on the moon's surface. But are today's telescopes powerful enough to see what's there? See <a href="ht ...