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AST 111 Test with Questions Solved 100% Correct
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AST 111 Test with Questions Solved 100% Correct
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AST 111 Test with Questions Solved 100%Correct
In the present theory of the Big Bang in the universe, what significant event occurred at
about 380,000 years after the start of the Big Bang? - ✔✔The universe became
transparent to neutrinos
What is "dark energy" - ✔✔the unseen matter-energy needed to make the observed
curvature of space spherical (as we believe it should be) while the observed matter-
energy only makes it hyperbolic
The intrinsic brightness (represented by luminosity) of a Cepheid variable star compared
to that of the Sun is - ✔✔several thousand times larger
The typical diameter of a spiral galaxy is about - ✔✔100 light-years
Whether or not a galaxy has a bar is apparently determined by - ✔✔how much dark
matter there is
Which of the following galaxy types contain little or no interstellar dust or gas? -
✔✔ellipticals
What is a lenticular (S0) galaxy - ✔✔a galaxy with a disk and central bulge like a spiral
galaxy, but with no spiral arms
If we compare an elliptical galaxy and a spiral galaxy of the same mass a billion years
after both began formation, - ✔✔the elliptical galaxy will have formed more stars
than the spiral
, According to Newton's law of gravity, why does Earth orbit the Sun - ✔✔The Sun
exerts a gravitational force on Earth across empty space.
According to General Relativity, why does Earth orbit the Sun - ✔✔Space around the
Sun is curved and Earth follows this curved space
Theoretically, the mass of a black hole - ✔✔can have any mass.
What is the event horizon of a black hole? - ✔✔the "surface" from the inside of
which nothing can escape
What is the Schwarzschild radius of a black hole? - ✔✔the radius of the singularity
How are antiparticles and virtual particles related? - ✔✔All virtual particle pairs
include a particle and its antiparticle.
What is the last nuclear burning stage in the life of a low-mass star like the Sun -
✔✔fusion of silicon nuclei to form iron
A planetary nebula is - ✔✔a shell of gases ejected from the surface of a red giant
star, glowing from fluorescence caused by UV light from the hot, central white dwarf
star
Stars that have ejected a planetary nebula go on to become - ✔✔white dwarfs
A Type II supernova is the - ✔✔explosion of a single massive star after silicon burning
has produced a core of iron nuclei.
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