Less than 20 years
As of Tuesday (Oct.
"Where we are,
And the 1,000th
Alien worlds
Most of these
Astronomers can
Astronomers first
Since then, however,
That trend will
The Kepler mission,
Researchers are
When such work is
"One could
The number of
Recent discoveries
"We have a
Reaching other
Other important
The rocky, roughly
When a planet
So the discovery of
"I wouldn't be
- Gallery: