How do shock waves aid in the formation of stars?
What will be an ideal response?
Most clouds do not appear to be gravitationally unstable and will not contract to form stars on their own. However, a stable cloud colliding with a shock wave (the astronomical equivalent of a sonic boom) can be compressed and disrupted into fragments. Theoretical calculations show that some of these fragments can become dense enough to collapse under the influence of their own gravity and form stars.Supernova explosions produce shock waves that compress the interstellar medium, and recent observations show young stars forming at the edges of such shock waves. Another source of shock waves may be the birth of very hot stars. A massive star is so luminous and hot that it emits vast amounts of ultraviolet photons. When such a star is born, the sudden blast of light, especially ultraviolet radiation, can ionize and drive away nearby gas, forming a shock wave that could compress nearby clouds and trigger further star formation. Even the collision of two interstellar clouds can produce a shock wave and trigger star formation.
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The applied magnetic field that it is necessary to reduce the intensity of magnetization of a ferromagnetic material to zero after saturation in the forward direction is the _________field.
Fill in the blank(s) with the appropriate word(s).
Advantages of radio astronomy include
A) radio waves are not scattered or deflected by Earth's atmosphere. B) radio observations can be made even when the Sun is in the sky. C) radio observations can be made even when the sky is obscured by clouds. D) radio observations let astronomers study things that emit little visible light. E) all of the above.
Two identical stars are located at different distances, one star at 2.0 pc and the other at 6.0 pc. How many times greater is the apparent brightness of the nearer star when compared to the more distant one?
A) 1.7 times B) 3.0 times C) 9.0 times D) 18 times E) 27 times
The specific heat capacity of copper is three times the specific heat capacity of lead. Equal masses of copper and lead are heated from room temperature to the temperature of boiling water. To achieve this, the amount of heat added to the copper is __________ times the amount of heat added to the lead
Fill in the blank(s) with correct word