The Orion region contains young main sequence stars and an emission nebula, but the original molecular cloud they formed out of has been dispersed
Indicate whether the statement is true or false
F
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Careful measurements reveal that a star maintains a steady apparent brightness at most times, except that at precise intervals of 73 hours the star becomes dimmer for about 2 hours. The most likely explanation is that
A) the star is a Cepheid variable. B) the star is a member of an eclipsing binary star system. C) the star is periodically ejecting gas into space, every 73 hours. D) the star is a white dwarf.
Most of our knowledge of evolutionary tracks comes from stars found in ________
Fill in the blank(s) with correct word
The electric potential at the surface of a charged conductor
a. is always zero. b. is always independent of the magnitude of the charge on the surface. c. may be set equal to zero by adding an appropriate constant to the potential at all points of space. d. is always such that the potential is zero at all points inside the conductor. e. is always such that the potential is always zero within a hollow space inside the conductor.
This figure shows observations that have allowed astronomers to determine the orbits of several stars around Sgr A* (the central object). What can we learn about Sgr A* by analyzing these orbits?
A) its mass B) its age C) its chemical composition D) all of the above