David C wrote:Matt,,do you honestly think that something 600yds long has a 'gravity'? I don't think so. Unless a magnetic field can be defined as gravity. Look at all the rubble that has attached itself, and the random way it has happened.
Phobos and Deimos are small Asteroids, that act like a moons in orbit around Mars
Asteroids orbit the Sun, moons orbit planets. Therefore Phobos and Deimos are moons.
Any object with mass will have a gravitational field, the force from a 600m object may be small but in the absence of any other force it will be more than sufficient to hold a loose pile of rocks together. Remember that the whole solar system formed from a cloud of dust and gas attracted together by gravity. Gravity was sufficient even on those microscopic particles to pull them together, the tiny forces involved are not a problem.