The answer: by watching the asteroid directly pass in front of a star, which is called occultation.
What would it take to carry people to the Moon, or Mars, or an asteroid?
His game lasts until his final ship has either collided with an asteroid or lost a shootout with an enemy saucer.
The Tunguska asteroid event was so unusual that witnesses believed it was a visitation from a vengeful god.
A majority of these meteorites comes from collisions in the asteroid belt between Mars and Jupiter.
The question was, would the Connie try to set his ship down on the asteroid?
But the mechanism controlling the asteroid's invisibility was not destroyed.
Now there was only one thin pair of wires stretching between his ship and the drill on the asteroid.
Anything that kept them from selling an asteroid must be terrible indeed.
And they were doing a little target practice with plastic bubbles only a few miles above the asteroid.
Any of numerous small, often irregularly shaped rocky bodies that orbit the Sun primarily in the asteroid belt, a region between the orbits of Mars and Jupiter. Asteroids are intermediate in size between planets and meteoroids; the largest asteroid in the asteroid belt is Ceres, approximately 1,000 km (620 mi) in diameter, while the lower limit is variously given in the tens or hundreds of meters. While more than 1,800 asteroids have been cataloged, and as many as a million or more smaller ones may exist, their total mass has been estimated to be less than three percent of the Moon's. Asteroids are thought to be left over from the early formation of the solar system, when planetesimals in a protoplanetary disk were scattered after coming under Jupiter's gravitational influence. The continuing collision of planetesimals that remained between Jupiter and Mars caused many of them to fragment, creating the asteroids that exist today. Also called minor planet, planetoid.