The eccentricity of a planet's orbit describes
a. westward motion in the night sky when observed on successive nights.
b. the deviation in shape when compared to a circle.
c. its tilt with respect to the ecliptic plane.
d. the tilt of the planet's rotational axis with respect to the ecliptic.
B
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The average star spends ________ of its lifetime on the main sequence
a. 1% b. 2% c. 10% d. 20% e. 90%
Which is not a general characteristic of starburst galaxies?
A) The observed features that cause us to classify a galaxy as a "starburst" galaxy must be only temporary phenomena in the galaxy's history. B) The galaxy's rate of star formation is many times higher than the rate of star formation in the Milky Way. C) Supernovae occur so frequently that their effects combine to drive a galactic wind that blows material into intergalactic space. D) The "starburst" is thought to be caused by the presence of a supermassive black hole in the galaxy's center.
Imagine for a minute that the Moon is held in its orbit about the Earth by electrical forces rather than by gravitation. What electrical charges ?Q on the Earth and +Q on the Moon are necessary to hold the Moon in a circular orbit with a period of 27.3 days? The Earth-Moon distance is 384,000 km and the mass of the Moon is 7.35 × 1022 kg.
What will be an ideal response?
In optics, what is meant by an "interface?"
a. optically connecting one computer to another b. using the image created by one lens as the object for another lens c. when the crest of one wave lines up with the trough of another wave d. none of the above