Astronomy Blows

50 cards

These are flashcards for Astro Final.  It is going to suck.


 
  
Created May 4, 2009
by
chadz

 

 
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1
Of the three ways in which energy is transferred in nature (radiation, conduction, and convection)...
 
Radiation and Convection
2
Parallax is the 
 
Apparent shift in the position of a nearby object as we move.
3
What process provides the power for the sun?
 
Fusion of hydrogen into helium.
4
Granulation on the surface of the Sun in caused by 
 
Convective currents carrying heat from beneath the surface.
5
The nuetrino is
 
An elusive, subatomic particle having little or no mass and very difficult to detect.
6
What is the characteristic color of an emission nebula?
 
Red.
7
Astronomers measure the masses of stars by
 
Observing the motion of two stars in a binary star system.
8
A brown dwarf is 
 
An object intermediate between a planet and a star, with not enough mass to begin nuclear reaction...
9
The evolution of a star is controlled mostly by its
 
initial mass
10
The spectral sequence of star surface temperature as determined by relative spectral line strengths...
 
OBAFGKM
11
If stellar parallax can be measured to a precision of about 0.01 arcsec using a telescope on...
 
100 pc
12
What is a positron?
 
A positive electron.
13
The phrase "hydrostatic equilibrium" in the sun refers to:
 
the balance of gravity inward and gas pressure outward.
14
The Hertzsprung-Russell diagram is a statistical plot of which stellar parameters?
 
Luminosity and Surface temperature
15
An arching column of gas suspended over a sunspot group is called
 
A prominence 
16
The star Hadar has a spectral classification of B1 III.  This tells us that Hadar is a 
 
Hot Giant
17
Sunspots are 
 
Cooler, darker regions on the suns surface
18
Stars that have ejected a planetary nebula go on to become 
 
white dwarfs
19
The temperature of the center of the sun where thermonuclear processes take place is approximately 
 
1.5 x 107 K
20
The spectral class of the sun in G2 and the star Enif in K2.  From this information, we...
 
Cooler than the sun.
21
Where do we find the most massive stars on the main sequence in a HR diagram?
 
Upper left
22
What fraction of the stars in the night sky are main sequence stars?
 
Almost all, 90%
23
The temperature of the sun's photosphere is
 
5800 K
24
How can we characterize the rotation of the Sun?
 
Differential  rotation with the equator rotating faster than the poles
25
What occurance defines the end of the protostar phase of a star's life and the start of the...
 
Nuclear reactions begin in its core
26
What name is given to the visible "surface" of the Sun?
 
Photosphere
27
There is a mass limit for a star in the white dwarf phase, the Chandrasekhar limit, beyond...
 
1.4
28
The Zeeman effect refers to 
 
the splitting of spectral lines when magnetic fields are applied to atoms
29
What is a red giant?
 
A star burning hydrogen into helium in a shell around the core
30
What is the last nuclear burning stage in the life of a low mass star like the sun?
 
Fusion of helium nuclei to form carbon and oxygen
31
Degeneracy occurs when 
 
electrons inside a star resist being pushed closer together than a certain limit.
32
What proportion of visible stars in the night sky are multiple star systems?
 
About 50% or __
33
A corona hole shows up most prominently in photographs taken at what wavelength?
 
X-ray
34
The majority of the elements heavier than hydrogen and helium in the universe are believed...
 
The central cores of stars
35
The effect of interstellar dust on starlight is 
 
to dim and redden distant stars by preferentially scattering their blue light 
36
The corona of the Sun has a temperature of 
 
1-2 million K
37
Apparent Magnitude is a measure of the 
 
Brightness of a star as seen from Earth
38
From the center outwards, the order of the layers or parts of the Sun is
 
Radiative, convective, photosphere, chromosphere, corona
39
The extremely high gas temperatures in the solar corona mean that this region is best observed...
 
X-rays
40
The termperature at which thermonuclear reactions begin to convert helium into carbon (helium...
 
100 million K
41
Sunspots are caused by
 
Differential rotation and its effect on weak magnetic fields
42
A planetary nebula is
 
An expanding gas shell surrounding a hot, white dwarf
43
What is the most abundant element in the universe?
 
Hydrogen
44
The total time that the Sun will spend as a main sequence star is
 
About 10 billion years (1010 years)
45
At what distance are stars assumed to be from the Earth when they are represented by their...
 
10 years
46
What happens to the helium rich core of a star after the core runs out of hydrogen?
 
It contracts and heats
47
On the HR diagram, in which direction does the position occupied by a star move after hydrogen...
 
Towards the upper right
48
The age of a cluster can be found by 
 
Determining the turnoff point on the main sequence of its HR diagram
49
The Orion Nebula is
 
A large interstellar gas and dust cloud containing many young stars
50
The spectral type of a star is most directly related to (and determines uniquely) its 
 
surface temperature

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