But part of the problem with the definition - I mean, as an example - is that if you look at Mars - if Mars - if we discovered a Mars-sized object out beyond the orbit of Pluto, it couldn't be a planet, because over the age of the solar system it wouldn't have time to clear its orbit.

NPR: Astronomers Prepare to Fight Pluto Demotion

Geosynchronous satellites are so distant that their images aren't sharp, while low-earth orbit satellites, which fly as low as 100 miles, can feed information only when they pass over an area of interest.

FORBES: Companies, People, Ideas

The microbes didn't use the hydrazine to launch themselves into orbit, but as an intermediate step in a larger process.

FORBES: Magazine Article

The unofficial launch date is July 9, but I wouldn't be surprised to see the shuttle in orbit on July 4.

CNN: The View from Space

If Glenn was rattled by last week's lift-off he didn't say, but from the ground, the trip to orbit looked smooth.

CNN: Victory Lap