The visual pink glow of the Great Nebula in Orion

The visual pink glow of the Great Nebula in Orion

a. is a Herbig-Haro object.
b. is a reflection nebula of dust.
c. is an emission nebula of thin gas.
d. contains only young low mass stars.
e. is believed to be about 5 billion years old.

Question 2

Which of the following people did NOT accept a heliocentric model for the universe?

a. Kepler
b. Copernicus
c. Tycho
d. Galileo
e. Newton

Question 3

Opacity is

a. the balance between the pressure and force of gravity inside a star.
b. the force that binds protons and neutrons together to form a nucleus.
c. the force that binds an electron to the nucleus in an atom.
d. a measure of the resistance to the flow of radiation (photons) through a gas.
e. the temperature and density at which a gas will undergo thermonuclear fusion.

Question 4

A lunar eclipse can only occur during the full phase.

Indicate whether the statement is true or false

Question 5

____ are small luminous nebulae excited by nearby young stars.

a. T Tauri stars
b. Herbig-Haro objects
c. O associations
d. Bok Globule
e. Giant molecular clouds

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The visual pink glow of the Great Nebula in Orion

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