Suppose that an object doubles its luminosity in 10 hours. What can we conclude?
A) The object must be a quasar.
B) The object must be a Cepheid variable star.
C) The object is no more than about 10 light-hours across.
D) The object must be very far away, making it one of the most luminous objects in the universe.
E) The object is being orbited by another object with an orbital period of 10 hours.
C) The object is no more than about 10 light-hours across.
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_________emission occurs when a material is heated to a high temperature and electrons are emitted.
Fill in the blank(s) with the appropriate word(s).
The lithosphere of a planet is the layer that consists of
A) material above the crust. B) material between the crust and the mantle. C) the rigid rocky material of the crust and uppermost portion of the mantle. D) the softer rocky material of the mantle. E) the lava that comes out of volcanoes.
If a twin goes on a trip in a high-speed rocket ship, when she returns home she will be younger than her twin sister who did not go on the trip because of the special relativistic effect of __________
Fill in the blank(s) with correct word
How can we find the distance to a star that is too distant to have a measurable parallax?
What will be an ideal response?