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Fluorescence is a characteristic of A) emission nebulae B) planetary nebulae

Question : Fluorescence is a characteristic of A) emission nebulae B) planetary nebulae : 2147412

11) Fluorescence is a characteristic of ________.

A) emission nebulae

B) planetary nebulae

C) reflection nebulae

D) dark nebulae

E) blue nebulae

12) The red color of emission nebulae comes from the ________.

A) energy emission of oxygen

B) conversion of infrared light to visible light

C) conversion of ultraviolet light to visible light

D) energy emission of helium

E) energy emission of hydrogen

13) The reason scientists believe the reflective bright nebulae contain more heavy materials than the emission bright nebulae is that ________.

A) they glow brighter than an energy emission source could produce

B) they are brighter than a low density source could produce

C) they reflect more colors than the emission nebulae

D) they are dimmer than a low density source could produce

E) they are blue, and that color is associated with carbon

14) When viewed through an optical telescope, planetary nebula ________.

A) still have planets orbiting the cloud

B) are spherical in form and often have "rings" like Saturn

C) look like giant planets such as Jupiter

D) show the explosive form of the dead sun

E) have visible planets within their cloud of debris

19) The densest stars known to exist are ________.

A) white dwarfs

B) black holes

C) neutron stars

D) red dwarfs

20) A Hertzsprung-Russell diagram (H-R Diagram) is a plot of ________.

A) color versus brightness

B) temperature versus color

C) size versus color

D) brightness versus temperature

E) size versus brightness

21) A red star is ________ our Sun.

A) hotter and smaller than

B) colder and larger than

C) hotter and larger than

D) colder and smaller than

E) approximately the same temperature and size as

22) A blue star is ________ our Sun.

A) colder and smaller than

B) hotter and smaller than

C) colder and larger than

D) hotter and larger than

E) approximately the same temperature and size as

23) What is a "main sequence star"?

A) a star that falls in a band in a band on the H-R Diagram with most other stars

B) a star that shows the same trend in distance from earth and temperature as many other stars

C) a star that is statistically indistinguishable from 90% of all stars

D) a star that is aligned with many other, similar colored stars

E) a star that is in a group of stars with similar ages and sizes

26) On a Hertzprung-Russell Diagram, our Sun is classified as ________.

A) a yellow giant

B) a yellow dwarf

C) a mediocre star

D) an average star

E) a super star

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