All of the following are base units of the SI system except:
A)
kilogram.
B)
kelvin.
C)
meter.
D)
volt.
E)
candela.
D
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The lifetime of a star is determined by its initial ______________
Fill in the blank(s) with correct word
Radioactivity Basics: Neodymium 
Nd is an isotope that undergoes alpha decay. What isotope is the product of this decay?
A. 
Ba
B. 
Ce
C. 
Pr
D. 
Sm
E. 
Gd
Explain how we can estimate that there are about 50-100 billion galaxies in the observable universe
What will be an ideal response?
Why didn't they see flickering brightness that would show black holes were eating gas from mergers?
A: The earliest light went away from the galaxy in a different direction. B: Because black holes themselves didn't exist until much later. C: There's a delay between the merger and time gas and stars flow into black hole. D: Black holes need billions of years to grow large enough to swallow whole stars. E: Because mergers do not produce new stars and tend to disperse all gas in the region.