Astronomy Final Exam Part 2

All of the energy that the Sun produces comes from the

The curved line where most stars spend their time on the H-R diagram is called

What force is important in the contraction of a gas cloud into a star

Another name for the proton-proton chain is

The solar cycle is

The known laws of physics break down near the center of a black hole.

What keeps a star like the Sun from collapsing?

The apparent magnitude is

More massive stars evolve more slowly.

The part of the Sun we see all the time is called the corona.

We can tell that light has passed through a dust cloud because

Sunspots appear dark because they are hotter than the surrounding gas of the photosphere.

On the H-R diagram, White Dwarves appear

If the mass of a star is very large then it could possibly become a

What element marks the end of the fusion cycle?

What keeps a neutron star from collapsing?

The interstellar medium is made up of matter in the form of gas and dust.

21-centimeter radiation provides astronomers with information on interstellar molecular hydrogen gas.

One of the by-products of the proton-proton chain are these weird particles that can go through anything called

A nova explosion is due to hydrogen fusion on the surface of a white dwarf.

A solar flare is a violent explosive event in a solar active region.

What is the energy source of the Sun?

According to the general theory of relativity, space is warped, or curved, by light.

On the H-R diagram, Red Giants appear

Another name for the protostar phase in which the contracting gas cloud emits a large amount of solar wind is called

What is the name of the model that describes why neutron stars sometimes appear to be pulsars

The H–R diagram can be a plot of temperature on the horizontal scale versus luminosity on the vertical scale.

As you go up on the y-axis on the H-R diagram

Newly formed neutron stars have extremely strong magnetic fields.

If a star has a long lifetime, we can guess that

Matter accreting onto a black hole can emit X rays.

Nothing can travel faster than the speed of light.

A brown dwarf is

Solar activity is important to us on the earth because

What part of the Sun can we only see during a solar eclipse?

In order to become a black hole, a star must collapse and explode. The explosion is called a

Stars and planets are formed when

A planetary nebula is the disk of matter around a star that will eventually form a planetary system.

Heavy elements (heavier than iron) are produced

The solar neutrino problem is the fact that astronomers observe too many neutrinos coming from the Sun.

The place around a black hole from where nothing escapes is called

The radius of the place around a black hole from where nothing escapes is called is called

Red giants are very bright because they are extremely hot.

Sunspots are dark because

Sunspots are regions of intense magnetic fields.

Atomic hydrogen can be detected because

A star of apparent magnitude +5 looks brighter than one of apparent magnitude -2.

The point at which nothing can escape the gravitational pull of a black hole is called the event horizon.

As a cloud of gas contracts

Although visible light cannot escape from the event horizon of a black hole, high-energy radiation