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East Los Angeles College *
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Course
101
Subject
Astronomy
Date
Dec 6, 2023
Type
Pages
5
Uploaded by HighnessHeat11080
Assignment 2 (CH 5-8)
Name: Hilda Avalos
Chapter 5
1) Describe how exoplanets are discovered by measuring stellar radial velocities.
Answer: This method relies on the fact that a star does not remain completely stable
when a planet orbits. it slightly moves in an eclipse or small circle
2) Describe how exoplanets are discovered by measuring stellar brightness.
Answer: If a planet moves in a plane that takes it across its star as seen from Earth, then
the planet will hide some of the starlight and causes the star to dim from our perspective. A
change in brightness will occur periodically and can reveal the presence of a plane
3) Describe a method astronomers use to search for life on exoplanets.
Answer: Radial velocity- until recently when it was surpassed by transit, this method was
responsible for the majority of exoplanets discovered.
Direct imagery- astronomers have been able to find exoplanets in the simplest way possible
by seeing them, to be able to able to distinguish a planet from a star; it needs to be
relatively far away from it.
4) What is a habitable zone?
Answer: A region around any star where in water can exist in liquid form on a planet's
surface and hence, life as we know it can conceivably exist.
5) If there was a planet orbiting a first generation star, which planet in our solar system would it
resemble most? Would it be likely for such a planet to have life?
Answer: A planet orbiting a first-generation star would likely resemble Earth the most in
our solar system. However, whether it could support life depends on various factors,
including its distance from the star, atmosphere, and other conditions. Life is possible but
not guaranteed.
Chapter 6
1) What type of chemical or molecule is most common in Earth’s atmosphere?
a. carbon dioxide
d. nitrogen
b. oxygen
e. hydrogen
c. water vapor
Answer: Nitrogen
2) Describe how the Moon causes ocean tides on Earth?
Answer: The gravitational pull of the moon pulls the water from Earth and the sides of
earth become smaller so it creates low tides and on the opposite sides are high tides and
creates high tides.
3) Why does the Earth have a Moon?
Answer: Moon formation began when a giant object collided with the Earth; giant chunks
of material ejected into space from Earth's mantle; chunks clumped together and formed
moon.
4) Which pair of planets has atmospheres with the most similar chemical compositions?
a. Earth and Venus
d. Mercury and Mars
b. Earth and Mars
e. Mercury and Venus
c. Venus and Mars
Answer: Venus and Mars
5) Which planet is least likely to have water ice on or just under its surface?
a. Earth
b. Mars
c. Mercury
Answer: Mercury
6) Which object is most similar to Venus in size?
a. our Moon
b. Earth
c. Mercury
Answer: Earth
7) Why is it hotter on Venus than on Mercury?
Answer: The thick carbon dioxide atmosphere of Venus has prevented re-emission into
space of the heat absorbed from sunlight.
Chapter 7
1) Which is the most massive planet in the solar system?
a. Earth
d. Jupiter
b. Neptune
e. Mercury
c. Saturn
Answer: Jupiter
2) Which of the following does not have rings?
a. Mars
d. Saturn
b. Uranus
e. Jupiter
c. Neptune
Answer: Mars
3) What is the giant red spot that is seen on Jupiter?
Answer: The Great Red Spot is the most striking feature of Jupiter. It was discovered three
centuries ago in the southern hemisphere of the planet. Based on images from orbit, we can
conclude that the Great Red Spot is actually a cyclonic storm.
4) Which of the following is presently known to have the most moons?
a. Earth
d. Jupiter
b. Mars
e. Neptune
c. Uranus
Answer: Jupiter
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