A star leaves the main sequence when
A. it stops fusing hydrogen in its core and starts to expand.
B. it collapses, and its envelope becomes degenerate.
C. nuclear fuel in its core can supply enough energy to stop its collapse.
D. it forms planets.
Answer: A
You might also like to view...
Which is the earliest stage of a star?
A) Helium collects within the core. B) Carbon collects within the core. C) The surface of the star expands into a red giant. D) The star contracts into a blue giant.
What is the capacitive reactance of an 8.00 ?F V capacitor attached to 120 V rms at 60.0 Hz?
A. 166
B. 332
C. 663
D. 480
E. 960
The motion of a piston in an auto engine is simple harmonic. If the piston travels back and forth over a distance of 10 cm, and the piston has a mass of 1.5 kg, what is the maximum speed of the piston and the maximum force acting on the piston when the engine is running at 4 200 rpm?
What will be an ideal response?
An aggregate of two or more minerals is called a(n) ________.
Fill in the blank(s) with the appropriate word(s).