How does the age of the universe depend on the value of Hubble's constant, and why?
What will be an ideal response?
A larger value for the Hubble's constant means that the universe must be younger. This is because a larger value for Hubble's constant means that the universe is expanding faster, and therefore it must have taken less time to reach its current size.
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The dark gray areas of the Moon visible from Earth are called _____
A) maria B) albedo C) anorthosite D) breccias
Which of the following may be caused by a protostellar disk?
A) protostellar jets B) protostellar winds C) accretion of material onto the star D) relatively slow protostellar rotation E) all of the above
Suppose you live at latitude 40°N. Which of the following describes the conditions that make a star circumpolar?
A) Stars are circumpolar if they have declination > +50°. B) Stars are circumpolar if they have declination > +40°. C) Stars are circumpolar if they have right ascension > 6 hr. D) Stars are circumpolar if they have right ascension < 6 hr. E) No stars are circumpolar at this latitude.
The moons of Mars are believed to be captured ______________
Fill in the blank(s) with correct word