A comet is composed of a nucleus, a coma, and two kinds of tails. The nucleus, which is typically only about 1 to 10 miles across, is at the center of the comet. Fred Whipple, the Harvard ...

Related stories Shrinking worlds with comet-like tails could explain a planetary mystery As NASA has cataloged more than 5,000 alien worlds, it's become clear that two of the most common types of ...

“The shape of the transit is typical of a comet with a long tail,” said Marc Hon, another author of the study. “Except that it’s unlikely that this tail contains volatile gases and ice as ...

Comets come in two varieties: gas and dust ... In addition, the associated dust tails appear broad and quite bright and have a tendency to appear curved, since the dust particles that are ejected ...

To the astronomers observing it, the planet looks like a huge comet with a long tail of debris. That tail stretches nearly 6 million miles long, encircling about half the planet’s entire orbit. The ...

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