ASTR 102 Test Questions & 100% Solutions (Verified Answers)
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Course
ASTR 102
Institution
ASTR 102
What 2 observations tell us the universe is expanding? - Galaxies are moving away from us and
their speeds are proportional to distance
How does an objects red or blueshift relate to the object's movement? - Blueshift is when
an object is moving towards you. Redshift is when an object moves away...
ASTR 102 Test Questions & 100%
Solutions (Verified Answers)
What 2 observations tell us the universe is expanding? - ✔✔Galaxies are moving away from us and
their speeds are proportional to distance
How does an objects red or blueshift relate to the object's movement? - ✔✔Blueshift is when
an object is moving towards you. Redshift is when an object moves away from you
How does a galaxy's speed relate to its distance? - ✔✔The further away it is the faster it will move
Does the universe have a center? - ✔✔No
If we know the Hubble constant, what do we know about the universe? - ✔✔The rate of
expansion and age of the universe
Why is the cosmic distance ladder useful? - ✔✔It helps us to find Hubble's constant
What is look-back time? - ✔✔The time light has been on its way from a distant object
cosmological redshift - ✔✔The light is stretched out as it travels through the expanding universe
, Hubble time - ✔✔Time when the separation between all matter was zero and an estimate of the
age of the universe.
How does the value of the Hubble constant relate to the age of the universe? - ✔✔Hubble's
constant tells us the rate of expansion and the age of the universe
Where did the Big Bang happen? - ✔✔Everywhere
Do galaxies, stars, etc. expand as the universe expands? - ✔✔Everything expands, galaxies are
further apart and they will continue to grow further apart.
What did the universe look like in the past? - ✔✔Denser, hotter, and smaller than it is today
What was the universe like at the moment of the Big Bang? - ✔✔Hot dense energy, no matter,
stars or galaxies
What was affected by the expansion of the universe? - ✔✔Space and light
Imagine that you could travel at the speed of light. Starting from Earth, how long would it take you
to travel to the center of the Milky Way Galaxy? - ✔✔25,000 years
In general, the Milky Way - ✔✔Has more abundant heavy elements as time passes
In the disk of the Milky Way, stars are ___________ and dust and gas are _________ than in the halo. -
✔✔Younger;denser
The Milky Way galaxy - ✔✔Is still evolving, consuming nearby galaxies
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