ASTEROIDS

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Future human space travel will consist of many trips to Mars, many moons and nearby asteroids. Asteroids are small and are disturbed quite often so their rotations will be likewise chaotic. Asteroids can reach as large as 583 miles across so some people consider it a dwarf planet. One of the smallest asteroids discovered in 1991 was only 20 feet across. the average temperature of the surface is minus 100 degrees f.
As asteroids resolve around the sun in elliptical orbit it rotates sometimes tumbling quite irregularly. Ever since earth formed about 4.5 billion years ago asteroids and comets have been slamming into the planet. The most dangerous asteroids are extremely rare says NASA
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The brightness of an asteroid depends on the size and from the distance of the observer and is therefore measured as a relative magnitude. The apparent brightness depends on the degree of illumination of the asteroid called the phrase of object in analogy to the positions of the moon.
Asteroids are small airless rocky world revolving around the sun that are too small to be called a planet. Most asteroids lie in a vast ring between the orbits of mars and jupiter. Aten, Amors and Apollos known as near earth asteroids orbit in the inner solar system and sometimes cross the path of earth and mars. the main belt holds more than 200 asteroids larger than a 60 mile diameter.
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Scientist estimate the asteroid belt also contains more than 750000 asteroids larger than three fifths of a mile in diameter and millions of smaller ones. More than 150 asteroids were found with a moon some have 2 moons. The total mass of asteroids are less than the moon.


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NASA: Asteroid Will Not Hit Earth