Short-period comets, such as Halley's Comet, are believed to come from the ______________

Fill in the blank(s) with correct word


Kuiper Belt

Physics & Space Science

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Which portion of the electromagnetic spectrum is used to identify fluorescent minerals?

a. ultraviolet light b. X rays c. infrared waves d. gamma rays

Physics & Space Science

A heat engine having an efficiency of 0.20 takes in 2000 J of energy from the hot reservoir in one cycle. In the same time, how much work will it perform?

A. 0 J B. 33,333 J C. 400 J D. 1000 J E. 120 J

Physics & Space Science

If the temperature and number of molecules remain constant for a gas, a pressure increase results in a volume ______________

Fill in the blank(s) with correct word

Physics & Space Science

Most of the Seyfert galaxies are ________.

A. spiral B. irregular C. elliptical D. All of these choices are correct.

Physics & Space Science