Astronomy 2002 -UCF Midterm 1 Exam
With 100%Accurate Solutions 2025-
2026 Updated.
What is Astronomy? - Answer -A natural science that tries to understand, explain,& predict
observations of the world.
-The study of celestial objects: outside of Earths atmosphere (stars, moons, suns, planets,
galaxies)
Why study Astronomy? - Answer -it's the study of everything & encompasses many subjects.
What is modern astronomy? - Answer -more than cataloguing objects
-How does matter and energy work?
-What is the universe and how do humans fit into it?
Cosmic Address - Answer Earth, Solar System, Milky Way, Local Group, Virgo Supercluster,
Observable Universe
What units are used in Astronomy? - Answer -SI system
-KM
-Astronomical Units (AU)- Average distance from Earth to Sun (1AU=1.4x10^11meters)
What unit do we use for time travel? - Answer Light Year
-1LY= distance light travels in one year through space
(5.879 trillion miles)
-Speed of light (c)
Light Travel Time (LTT) - Answer -Time it take to travel from A to B
LTT Moon from Earth - Answer 1 1/3 sec
LTT sun from Earth - Answer 8.5 minutes
Look back time (LBT) - Answer -how far back in time we see in years equal to light traveled
, Facts - Answer Statements that are objectively true
Hypothesis - Answer A tentative explaination
Theory/Laws - Answer Shown to be true
-Theory explains why something happens
-Law doesn't have an explanation
Principals - Answer General ideas or senses about how the universe is that guides the
construction of new theories
(cosmological principal)
Cosmological Principle - Answer -there is nothing special about our place in the universe.
-matter and energy obey same physical laws everywhere
falsifiable statement - Answer -Universe is so complicated, we need a clear and concise way
to write down ideas, theories, etc
-Can be tested to determine if it is false
-Only one observation needed to disprove it
What is 100,000 LY across? - Answer The Milkyway
What cosmic address would the Virgo Supercluster fit in? - Answer Universe / Continent
The Andromeda galaxy is about 2,500,000 ly away. Thus, the light that we observe from
Andromeda was emitted... - Answer 2,500,000 years ago
Imagine that you were observing a distant star that was located in a galaxy 100 million ly away
from you. By analysis of the starlight received, you are able to tell that the image we see is of a
10 million year old star. You are also able to predict that the star will have a lifetime of 50 million
years, at which point it will end in a catastrophic supernova.
How old does the star appear to us here on Earth (in million yrs) - Answer 10
Imagine that you were observing a distant star that was located in a galaxy 100 million ly away
from you. By analysis of the starlight received, you are able to tell that the image we see is of a
10 million year old star. You are also able to predict that the star will have a lifetime of 50 million
years, at which point it will end in a catastrophic supernova.
With 100%Accurate Solutions 2025-
2026 Updated.
What is Astronomy? - Answer -A natural science that tries to understand, explain,& predict
observations of the world.
-The study of celestial objects: outside of Earths atmosphere (stars, moons, suns, planets,
galaxies)
Why study Astronomy? - Answer -it's the study of everything & encompasses many subjects.
What is modern astronomy? - Answer -more than cataloguing objects
-How does matter and energy work?
-What is the universe and how do humans fit into it?
Cosmic Address - Answer Earth, Solar System, Milky Way, Local Group, Virgo Supercluster,
Observable Universe
What units are used in Astronomy? - Answer -SI system
-KM
-Astronomical Units (AU)- Average distance from Earth to Sun (1AU=1.4x10^11meters)
What unit do we use for time travel? - Answer Light Year
-1LY= distance light travels in one year through space
(5.879 trillion miles)
-Speed of light (c)
Light Travel Time (LTT) - Answer -Time it take to travel from A to B
LTT Moon from Earth - Answer 1 1/3 sec
LTT sun from Earth - Answer 8.5 minutes
Look back time (LBT) - Answer -how far back in time we see in years equal to light traveled
, Facts - Answer Statements that are objectively true
Hypothesis - Answer A tentative explaination
Theory/Laws - Answer Shown to be true
-Theory explains why something happens
-Law doesn't have an explanation
Principals - Answer General ideas or senses about how the universe is that guides the
construction of new theories
(cosmological principal)
Cosmological Principle - Answer -there is nothing special about our place in the universe.
-matter and energy obey same physical laws everywhere
falsifiable statement - Answer -Universe is so complicated, we need a clear and concise way
to write down ideas, theories, etc
-Can be tested to determine if it is false
-Only one observation needed to disprove it
What is 100,000 LY across? - Answer The Milkyway
What cosmic address would the Virgo Supercluster fit in? - Answer Universe / Continent
The Andromeda galaxy is about 2,500,000 ly away. Thus, the light that we observe from
Andromeda was emitted... - Answer 2,500,000 years ago
Imagine that you were observing a distant star that was located in a galaxy 100 million ly away
from you. By analysis of the starlight received, you are able to tell that the image we see is of a
10 million year old star. You are also able to predict that the star will have a lifetime of 50 million
years, at which point it will end in a catastrophic supernova.
How old does the star appear to us here on Earth (in million yrs) - Answer 10
Imagine that you were observing a distant star that was located in a galaxy 100 million ly away
from you. By analysis of the starlight received, you are able to tell that the image we see is of a
10 million year old star. You are also able to predict that the star will have a lifetime of 50 million
years, at which point it will end in a catastrophic supernova.
