Briefly describe the Orion Nebula
What will be an ideal response?
On a clear winter night, you can see with your unaided eye the Great Nebula of Orion as a fuzzy wisp in Orion's sword. With binoculars or a small telescope it is striking, and through a large telescope it is breathtaking. At the center lie four brilliant blue-white stars known as the Trapezium, the brightest of a cluster of a few hundred stars. Surrounding the stars are the glowing filaments of a nebula more than 8 pc across. Like a great thundercloud illuminated from within, the churning currents of gas and dust suggest immense power. The significance of the Orion Nebula lies hidden, figuratively and literally, beyond the visible nebula. The region is ripe with star formation.
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The warmth you feel from the Sun at the beach is an example of __________
Fill in the blank(s) with correct word
When an air mass passes from a maritime source region to a warmer continental region, heating from the warmer land causes
A) frontal lifting. B) orographic lifting. C) convectional lifting. D) adiabatic lifting.
This photo shows gas associated with a protostar. What is this gas doing?
A) It is flowing outward in two opposite directions from the protostar. B) It is gas that is gradually accreting onto the protostar. C) It is part of a protostellar disk in which planets may someday form. D) It is gas blown off the protostar's surface as a protostellar wind.
What is the theoretical efficiency of a Carnot engine that operates between 600 K and 300 K?
A) 100% B) 75% C) 25% D) 50% E) 0%