Motions of objects near our Galaxy's core suggest the central black hole is about 3.7 billion solar masses
Indicate whether the statement is true or false
FALSE
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Pulsars were discovered because they _____
a. provide the energy to ionize supernova remnants b. radiate gravitational waves c. absorb matter from a binary companion through an accretion disk d. emit short, regular bursts of radiation e. undergo nova eruptions on a regular period of a few years
Suppose you are in an elevator that is traveling upward at constant speed. How does your weight compare to your normal weight on the ground?
A) It is the same. B) It is greater. C) It is less. D) You are weightless.
Noting the turnoff mass in a star cluster allows you to determine its:
A) distance. B) radial velocity. C) age. D) total mass. E) number of stars.
How old is the Galaxy? How do we know this?
What will be an ideal response?