You may omit the comma following a short introductory phrase: On Thursday the committee decided the dispute. In 1954 the Supreme Court desegregated the public schools. But if you omit this comma once, you should do the same throughout the paper for all short introductory phrases.
But, over time the differences seen among the ever growing number of these visitors has led to many more categories than three. At the present there are approximately fifty types of meteorites recognized. They still fall mainly into the three original families; the irons, the stony-irons and the stones.
A meteor is an asteroid or other object that burns and vaporizes upon entry into the Earth's atmosphere; meteors are commonly known as shooting stars.. If a meteor survives the plunge through the atmosphere and lands on the surface, it's known as a meteorite.Meteorites are usually categorized as iron or stony. meteor is an asteroid or other object that burns and vaporizes upon entry into the Earth's atmosphere; meteors are commonly known as shooting stars.. If a meteor survives the plunge through the atmosphere and lands on the surface, it's known as a meteorite. Meteorites are usually categorized as iron or stony.