astronomy home work help plzz?

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Main sequence stars are burning the lighter element to form the heavier element in a process called nuclear fusion. Hydrogen is lighter than Helium.

Typically the age of any cluster is determined by the majority age of the stars in the cluster.

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Globular clusters have millions of stars, never just a few hundred.

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Alpha Centaurus A is just a little bigger than the sun, the other two stars in the triple system are smaller than the sun. If you consider the mass of all three stars as one, Alpha Centaurus then it is at least twice as big as the sun.
 
Main-sequence stars, like the Sun, shine by _____ in their interiors.
a. converting hydrogen into helium
b. converting helium into hydrogen
c. burning fuel such as coal
d. both a and c

The age of an open cluster can be determined by studying an H-R diagram and
a. counting the number of its stars on the main sequence.
b. determining the turnoff point of the cluster's main sequence.
c. calculating the amount of hydrogen that has been used in the oldest star.
d. observing the spectral changes in one of the stars as it uses up its hydrogen.

Which of the following characteristics is NOT a characteristic of a globular cluster?
a. contains a few hundred stars
b. is roughly spherical in shape
c. contains highly evolved stars
d. is usually less than 100 parsecs across

Star clusters that are closest to Earth are
a. globular clusters.
b. variable star clusters.
c. Mira clusters.
d. open clusters

The pulsating variable stars with the smallest radius are
a. RR Lyrae stars.
b. Mira variables.
c. T Tauri stars.
d. Cepheid variables.

The "instability strip" on the H-R diagram is found
a. slightly above the main sequence.
b. along the main sequence.
c. slightly below the main sequence.
d. to vary significantly depending on the specific star cluster

The distance at which binary stars begin to exchange mass is about
a. 1 astronomical unit.
b. 1 light-year.
c. 1 parsec.
d. 1 megaparsec.

Compared to the nearest star, Alpha Centauri, the Sun is
a. much smaller.
b. much older.
c. much hotter.
d. nearly identical.
 
Main sequence stars are burning the lighter element to form the heavier element in a process called nuclear fusion. Hydrogen is lighter than Helium.

Typically the age of any cluster is determined by the majority age of the stars in the cluster.

Skip

Globular clusters have millions of stars, never just a few hundred.

Skip

Alpha Centaurus A is just a little bigger than the sun, the other two stars in the triple system are smaller than the sun. If you consider the mass of all three stars as one, Alpha Centaurus then it is at least twice as big as the sun.
 
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