Which of the following information is required to compute the mass of a galaxy using the rotation curve method?
A) The age of the galaxy
B) The distance of the galaxy from the nearest rich galaxy cluster
C) The total number of stars in the galaxy
D) The true sizes of the orbits of stars or gas clouds within the galaxy
D
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A(n) ______ is the page that your browser navigates to when you click a link in an ad, email, or other online promotion.
A. subsidiary B. home C. landing D. splash
We can't detect stellar parallax with naked-eye observations. Which of the following would make parallax easier to observe?
A) getting away from streetlights B) Speeding up the precession of Earth's axis C) speeding up Earth's orbital motion D) slowing down Earth's orbital motion E) increasing the size of Earth's orbit
Pluto is different from the other outer planets in all of the following ways except which one?
A) Its orbit is not very close to being circular. B) It has only one moon. C) Its surface temperature is very cold. D) It is made mostly of ices. E) It doesn't have rings.
The neutrino was proposed by Pauli to overcome the apparent violation of which of the following conservation laws in beta decay?
A. energy B. momentum C. energy and momentum D. charge E. energy, momentum, and charge