E&O 10

The brightness of a star as it appears from Earth.

• apparent magnitude

• absolute magnitude

• magnitude

• stellar magnitude

The ACTUAL brightness of a star.

• apparent magnitude

• absolute magnitude

• magnitude

• stellar magnitude

A chunk of space debris that has reached the surface of the Earth.

• meteor

• meteoroid

• meteorite

• asteroid

He proposed the idea that the earth and all other planets orbit the sun.

• Copernicus

• Galilei

• Kepler

• Nazarie

This moon orbits Saturn in an opposite direction.

• Phoebe

• Mimas

• Vega

• Iapetus

What is the nebular hypothesis evolutionary idea?

• The claim the solar system formed from a cloud of gas and dust

• The claim that the solar system formed from a small spiral galaxy that imploded

• The claim that the solar system formed from a the convergence of two gas clouds

• I have no idea and don't to think about it

What is aphelion?

• the point when the orbit of a planet is at the furthest point from the sun

• the point when the orbit of a planet is at the closest point to the sun

• the point when the orbit of a planet is at the furthest point from the moo

• the point when the orbit of a planet is at the maximum rotations possible

The brightness of average stars in the main sequence is primarily determined by what?

• size

• temperature

• color

• luster

A group of galaxies can form many different structures. What is the smallest structure it can form?

• supercluster

• cluster

• clump

• coud

This rotating neutron star emits beams of radio waves.

• pulsar

• nova

• nebula

• supernova