Typical novae occur when

After the red supergiant phase, if the stellar core retains four solar masses, the result would be a:

Which one of the following statements about our Milky Way Galaxy is false?

High-redshift arcs around clusters of galaxies at low redshifts are now thought to be examples of gravitational lensing.

White dwarf stars

Planetary orbits about the Sun have slower orbital speed far from the Sun. The rotation curve of our galaxy suggests that orbital speed is constant along the spiral arms. To understand the role of gravity, it has been proposed that our Galaxy has mass at great distances from the galactic center. What does the text identify makes up most of that mass?

The 21-cm line observed by radio astronomers comes from

Which kind of galaxies are compact, have only visible red dwarfs, have little dust & gas but are disk-shaped without arms?

How would we recognize the presence of a black hole?

A dark nebula reflects light from stars that are near the gas.

What would be found on the Main Sequence?

Out of about 1012 solar masses in the Milky Way, 4 million solar masses are found in the center in what object?

Which pair of scientific notation match 560,000,000 0.12

By using the method of gravitational lensing, we can measure the total mass (light matter + dark matter) of the lensing object.

When a main-sequence star runs out of hydrogen fuel in its core,

At the present time, stars in our Galaxy tend to be most readily formed in

Which statement regarding deuterium is false?

Clouds of ionized hydrogen are called emission nebulae or

Spiral arms are usually the most prominent features in the disk of a spiral galaxy. Which one of the statements about spiral arms is false?

Distant galaxies have small lookback times, allowing us to study the evolution of galaxies.

Inverse square law: If Stars Fred and Ernie have the same apparent brightness, but Star Fred is 4 times farther away from Earth than Star Ernie, then Star Ernie's luminosity (absolute magnitude) is _________ times the luminosity of Star Fred. o Earth * Ernie * Fred

Where does the hydrogen fuel come from to cause a white dwarf to nova or supernova?

Which kind of galaxies are compact, have only visible red dwarfs, have little dust & gas but no disk or arms?

The retrograde motion of Pluto can be attributed to the relatively high eccentricity of its orbit around the Sun, as compared normal planets.

Which one of the following statements about the expanding Universe and Hubble's law (v = Hod) is false?

A white dwarf in a binary star system can undergo nuclear reactions on its surface, producing a nova but not destoying the entire star.

Which celestial body has a retrograde rotation?

Spiral galaxies contain only relatively young stars; there are no ancient stars anywhere within them.

The chemical composition of a black hole can be determined from measurements conducted outside the black hole.

Mass exchange from one star to the other can occur if one star extends into the ________________ of its companion.

Which one of the following statements about galaxy evolution is false?

Structure of the Universe: 2dF and the Sloan Microwave Digital Survey plotted clusters of galaxies. What kind of structure was seen among super-clusters of galaxies?

The Sculptor Galaxy is spiral galaxy of Hubble type Sc, located within the Local Group. It is located 11.7 million light years from us. What is its lookback time? Please write out the whole number (long hand with zeros and commas) and the correct units.

At mid-northern latitudes (California), the full moon passes higher in the sky in winter than in summer.

A red giant forms a planetary nebula when its outer atmosphere becomes unstable, producing a gentle ejection of hydrogen and helium, while leaving a neutron star.

Hubble's Law implies that:

The presence of a black hole in a galatic core can be inferred from:

Which planet's orbit is elliptical enough that the seasons are not equal in length?

An emission nebula can form when gas is ionized by a nearby young star, often of spectral type G, K, or M.

Match something in its possible evolutionary line with its progenitor: Red giant

Match something in its possible evolutionary line with its progenitor: Type II supernova

Match something in its possible evolutionary line with its progenitor: Type Ia Supernova

Match something in its possible evolutionary line with its progenitor: gravitational waves

Match something in its possible evolutionary line with its progenitor: Nova

Match something in its possible evolutionary line with its progenitor: White dwarf and planetary nebula

Match something in its possible evolutionary line with its progenitor: Supernova remnant

Where in our galaxy is there enough dust and gas to make new stars?

In what kind of nebula would we find ionized gas sending out its own light?

Galaxies move about the center of mass of their supercluster, sometimes merging due to:

Inside a red supergiant, denser elements fuse and emit sufficient energy to balance thermal expansion versus gravity, until ________________ is produced.

What is a planetary nebula?