Hidden in the south part of England, surrounded by grassy plains lies
Stonehenge. Stonehenge is a very unique circle made of stone. In its original form
has been measured to be about 100 meters in diameter, and having two
entrances. Around 2500
Astronomy homework chapter 5
in the central cores of stars *
in the surface layers of stars
at the event horizons of massive
in the dark clouds of d
Astronomy chapter 10 homework
the release of gravitational energy as the Sun
thermonuclear fusion of hydrogen into helium in
the core. *
thermonuclear fission of helium into hyd
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Classical Greek astronomers believed the motions of the heavens
could be described by uniform circular motion.
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The Copernican model of the solar system has the planets orbit
the sun along ellip
In science: the colors are the opposite representations of what were used to
o Blue represents the heat
o Green/yellow represents the cool
3.3 changeable Moon
Motion of moon
o 5 degree tilt to ecliptic
o CCW orbit
o moving eastward ~ degree/hr or 13 degr
At about what time of day is the sun farthest above the horizon?
Turn off the sun and watch the stars cross the southern sky. Where is the
south celestial pole?
Below the southern horizon
Use the animation to look directly east and watch the stars an
Webcourses says that the grades will not be kept past the last day of lecture, and they will not be
accurate anyway so you have to keep track of them yourself.
4. Homework is through the Cengage MindTap homework portal that you can access via
Parallax is an artificial movement, because the object youre seeing is not really moving.
It just appears to be moving.
o The closer an object is to us, the more we see parallax
o The further away, the less parallax we see
o Planets appear to move in a r
CHAPTER 10STRUCTURE AND FORMATION OF STARS
1. Protostars are difficult to observe because
the protostar stage is very short.
they are surrounded by cocoons of
gas and dust.
they radiate mainly in the infrared.
all of the above
Chapter 12 Milky Way Galaxy:
o Optical observations by Herschels in 1785
Seen edge on, Herschels model of the star system was a very irrefular
Millstones used to grind flour were thick disks that reminded astronomers
of the disk shape
ISM is where dense H molecular clouds form baby stars
Find H molecular clouds via tracers (e.g., CO)
Molecular hydrogen clouds are the coldest items we have; they are colder than atomic
ISM in different EM Bands
o A. 21 cm emission line reveals
The most accurate stellar parallax measurements for distances to the
majority of stars in our neighborhood of the universe have been made by
1. the Hubble Space Telescope.
2. the Hipparchos satellite.
3. the Very Long Basel