What is causing the Trifid Nebula to glow?
What will be an ideal response?
In this nebula, there is a single energetic star that is producing enough electromagnetic radiation to ionize much of the nebula. When electrons recombine with hydrogen atoms, the photon released is red, causing the characteristic red glow.
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Which is more common: a star blows up as a supernova, or a star ejects a planetary nebula?
A) Planetary nebulas are more common. B) Supernovae are more common. C) They both occur in about equal numbers. D) It is impossible to say.
A billiard ball collides in an elastic head-on collision with a second stationary identical ball. After the collision which of the following conditions applies to the first ball?
a. maintains the same velocity as before b. has one half its initial velocity c. comes to rest d. moves in the opposite direction
The three largest asteroids are:
A) Pluto, Sedna, and Quaoar. B) Deimos, Phobos, and Athos. C) Ida, Gaspra, and Mathilde. D) Ceres, Pallas, and Vesta. E) Halley, Hale-Bopp, and Hyakutake.
A satellite is placed in a geosynchronous orbit. In this equatorial orbit with a period of 24 hours, the satellite hovers over one point on the equator. Which statement is true for a satellite in such an orbit?
a. There is no gravitational force on the satellite. b. There is no acceleration toward the center of the Earth. c. The satellite is in a state of free fall toward the Earth. d. There is a tangential force that helps the satellite keep up with the rotation of the Earth. e. The force toward the center of the Earth is balanced by a force away from the center of the Earth.