If the Sun were to suddenly become a 1-solar-mass black hole, then the Earth wou
ID: 284787 • Letter: I
Question
If the Sun were to suddenly become a 1-solar-mass black hole, then the Earth would
A. slowly be destroyed by tidal forces
B. slowly be pushed outward due to the strong tidal forces from the black hole
C. continue to orbit the black hole as if nothing happened
D. continue to orbit the black hole but slowly get accreted into it
If the Sun were suddenly transported to the nuclear bulge of the Galaxy, the number of nearby stars would be
about the same as what we see from our present position in the Galaxy
far fewer than what we currently see
about twice what we currently see
much greater than what we currently see
Which is a correct statement about dark matter?
Dark matter is composed of normal matter that is too cold to emit light
Dark matter is composed of normal stars which are blocked by dust
We believe that it is there by its gravitational effects, but we don’t know what it is
We don’t really know if it’s there, but it helps explain quasars if it is
According to Olbers’ paradox, the night sky should be bright, not dark, because
in a finite universe, our line of sight will eventually intersect a star
in an infinite universe randomly scattered with stars, every line of sight should eventually intersect a star
the space between the stars is filled with dust, which also emits light
the Earth’s atmosphere should refract sunlight around to the night side of the Earth
Which of the following factors in the Drake equation is least well-known?
The rate at which Sun-like stars are forming
The fraction of Sun-like stars with planets
The fraction of planets where life evolves
The fraction of planets where intelligence evolves
A.about the same as what we see from our present position in the Galaxy
B.far fewer than what we currently see
C.about twice what we currently see
D.much greater than what we currently see
Explanation / Answer
1) answer ) C. continue to orbit the black hole as if nothing happened
reason : The Suns mass is much too low to become a black hole according to chandrasekhar limit (solar mass should be greater than 1.4), but even if it did become a black hole, the orbits of the planets and everything else around the Sun will remain unchanged. From a far distance , a black hole's gravity will act upon another planets just as the gravity acts
5 D) The fraction of planets where intelligence evolves
REASON :The variable - fraction of life-bearing planets where intelligence arises is not well known according to drakes equation
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