Why is there a two day difference in the sidereal and synodic months?
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the earth is also revolving around the sun, so the moon must "catch up"
what happens when a star exhausts its core hydrogen supply?
A) Its core contracts, but its outer layers expand and the star becomes bigger and
brighter.
B) It contracts, becoming smaller and dimmer.
C) It contracts, becoming hotter and brighter.
D) It expands, becoming bigger but dimmer.
E) Its core contracts, but its outer layers expand and the star becomes bigger but
cooler and therefore remains at the same brightness.
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, A) its core contracts, but its outer layers expand and the star becomes
bigger and brighter
in a closed universe a beam of light will:
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come back to where it originated
what is the range of star masses for high-mass stars ?
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between 8-100 solar masses
when a stars inward gravity and outward pressure are balances, the star is said to be:
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in hydrostatic equilibrium
what carries the majority of the energy from a supernova?
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, neutrinos
what are neutron stars and black holes formed by?
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type || supernovae
if a light source is approaching you at a speed very close to the speed of light, it will
appear
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bluer than it is
what is the main evidence that a black hole is at the galactic centre ?
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stars near the center are orbiting some unseen object
where on earth will you be if Polaris is at your Zenith
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the earth is also revolving around the sun, so the moon must "catch up"
what happens when a star exhausts its core hydrogen supply?
A) Its core contracts, but its outer layers expand and the star becomes bigger and
brighter.
B) It contracts, becoming smaller and dimmer.
C) It contracts, becoming hotter and brighter.
D) It expands, becoming bigger but dimmer.
E) Its core contracts, but its outer layers expand and the star becomes bigger but
cooler and therefore remains at the same brightness.
Give this one a try later!
, A) its core contracts, but its outer layers expand and the star becomes
bigger and brighter
in a closed universe a beam of light will:
Give this one a try later!
come back to where it originated
what is the range of star masses for high-mass stars ?
Give this one a try later!
between 8-100 solar masses
when a stars inward gravity and outward pressure are balances, the star is said to be:
Give this one a try later!
in hydrostatic equilibrium
what carries the majority of the energy from a supernova?
Give this one a try later!
, neutrinos
what are neutron stars and black holes formed by?
Give this one a try later!
type || supernovae
if a light source is approaching you at a speed very close to the speed of light, it will
appear
Give this one a try later!
bluer than it is
what is the main evidence that a black hole is at the galactic centre ?
Give this one a try later!
stars near the center are orbiting some unseen object
where on earth will you be if Polaris is at your Zenith
Give this one a try later!
