Chapter 11 Activity
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Polk State College *
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Course
1002
Subject
Astronomy
Date
Dec 6, 2023
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2
Uploaded by BrigadierFlyMaster929
HUBBLECAST NEBULA ACTIVITY
Watch Hubblecast 51
1. In what constellation is Sh 2-106 found?
a.
Sh 2-106 is found in the constellation of Cygnus.
2. What term does the Hubblecast use to describe the shape of the region? What causes this
shape?
b.
The Hubblecast uses the term hourglass because of the jets that are
slamming on the clouds, while the edges are compressed.
3. How large is the cloud of dust in the image?
c.
The cloud of dust in the image is around 2 light years in size.
4. Our text defines two common terms for the effects seen around a star in the last stages of
formation, both of which are shown here (but not mentioned by name in the video). What are
they?
d.
Reflection nebula and an emission nebula.
Watch Hubblecast 71
5. RS Puppis is a special type of star called a Cepheid Variable, which we will discuss in detail
later. At its brightest, the star has the same surface temperature as a main sequence G star, at
its dimmest, a K star. What type of nebula (discussed in the text) must the glowing area around
RS Puppis be, based on these temperatures and why?
a.
Based on the temperatures, the glowing area around RS Puppis is a
reflective nebula due to the fact that the temperature is regularly changing.
Also as seen in the images, the nebula that is around the star is blue in
color.
6. How are Cepheid variables important in studying celestial objects? What special information
can they give?
b.
Cepheid variables are important in studying celestial objects because the
period of their pulses are directly linked to their intrinsic brightness.
Astronomers can use them as cosmic distance markers.
Watch Hubblecast 73 (
https://www.spacetelescope.org/videos/heic1406a/
)
7. What is the National Galactic Catalog (NGC) number, and common name of the nebula in this
video?
a.
The NGC number is NGC 2174 also named the Monkey Head Nebula.
8. How far away is the nebula? In which constellation is it found?
b.
The nebula is 6,400 light-years away in the constellation of Orion.
9. What process is dissipating the nebula
c.
The process of fiery hot young stars triggering high-velocity winds that
blow the gas outwards.
Watch Hubblecast 82
10. What nebula is the image taken from?
a.
The image is taken from the Eagle Nebula’s Pillars of Creation.
11. Why is the new infrared image of the area useful? Explain what infrared reveals in the pillars
that visible light images can not.
b.
The new infrared image of the area is useful because it helps us to see past
the clouds and dust to get a better visual of the pillars. When infrared is
shown on the pillars it reveals the stars that are inside of the nebular that
wouldn’t be seen in visible light images.
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