yourstudybuddy

After a massive-star supernova, what is left behind?

What do we need to measure in order to determine a star's luminosity?

What do we mean when we say that the sun is in gravitational equilibrium?

When your friend flies by you in a spaceship at half the speed of light, you observe that

What happens to gas as it freely expands?

Which happens during the collapse of the solar nebula?

Why does jupiter have several distinct cloud layers?

Observations indicate that galaxies with more massive central black holes tend to also have

Why do astronomers hypothesize that a massive black hole lies at the center of m 87?

Which of the following statements about the celestial equator is true at all latitudes?

A) It extends from your horizon due east, through your zenith, to your horizon due west.

B) It lies along the band of light we call the Milky Way.

C) It cuts the dome of your sky exactly in half.

D) It represents an extension of the earth's equator onto the celestial sphere.

E) It extends from your horizon due north, through your zenith, to your horizon due south.

In structure, our milky way is most similar to

Why your rocket could never reach the speed of light?

Galactic disks appear blue because

Why do we see a gravitational redshift in the spectrum of the sun?

Some jovian planets give off more energy than they receive because of

1. fusion is taking place in their cores.
2. tidal heating is occurring.
3. they are still slowly contracting after formation.

Two stars that are in the same constellation

Which of the following is the origin of almost all the large moons around the jovian planets?

 A) They are captured asteroids.

B) They are captured comets.

C) They are captured planets.

D) They were formed by condensation and accretion in a disk of gas around the planet.

E) They were formed by giant impacts.

The globular cluster m13 belongs to the ............of the milky way galaxy.

Why do astronomers need different telescope designs to observe across the electromagnetic spectrum?

A) New telescopes incorporate new technology to increase their efficiency.

B) Telescopes have to adapt to the greater distortion of the atmosphere at shorter wavelengths.

C) Photons of different energy behave differently and require different collection strategies.

D) Light pollution is worse at radio wavelengths than visible wavelengths.

E) Astronomers and engineers enjoy the challenge of making new telescope designs.

Which statement must be true in order for a rocket to travel from earth to another planet?

A few hundred tons of comet dust are added to Earth daily from the millions of meteors that enter our atmosphere. Estimate the time it would take for Earth to get 0.1% heavier at this rate.

Most of the mass of the milky way seems to exist in the form of

Which one of the following is not one of the four major features of the solar system?

a. Planets fall into two major categories (terrestrial and jovian).
b. Large bodies in the solar system have orderly motions.
c. Several exceptions to the general trends stand out.
d. Swarms of asteroids and comets populate the solar system.
e. The solar system contains eight planets plus dwarf planets (such as Ceres, Pluto, and Eris).

The nucleus of an active galaxy contains several components. Explain.

The jovian moon with the most geologically active surface is

Earth is made mostly of metals and rocks. Where did this material come from?

active galaxies are very luminous because they

In what range of masses are most stars found?

A. 0.1 to 5 Solar masses

B. 0.0001 to 20 Solar masses

C. 0.1 to 100 Solar masses

D. 0.001 to 10 Solar masses

In terms of heart disease risk, which of the following is true?

A. As LDL cholesterol levels increase there is a decreased risk.

B. As HDL cholesterol levels increase there is an increased risk.

C. As LDL cholesterol levels increase there is an increased risk.

D. As HDL cholesterol levels decrease there is a decreased risk

what do astronomers mean by light pollution?

The most metal-rich terrestrial planet is

A. Mercury

B. Pluto

C. Mars

D. Earth

What are the three principal sources of the internal heat of terrestrial planets?

A) conduction, differentiation, and accretion.

B) accretion, differentiation, and radioactivity.

C) accretion, differentiation, and eruption.

D) convection, differentiation, and eruption

Umbra and penumbra. 

What do you mean by jovian planets?

Most common elements in the universe

Planetesimals.

What is the life cycle of a star?

How are we related to stars?

what is physics?