Chapter 14: Stars

Question 1

What is the closest star to earth?

Answer 1

Proxima Centauri

Question 2

They are large incandescent balls of plasma held together by gravity

Answer 2

Stars

Question 3

They generate energy through thermonuclear ______ __ ________ nuclei in their core forming ______ _______

Answer 3

Fusion of hydrogen, helium nucleus

Question 4

What are the 4 characteristics of a star?

Answer 4

Brightness, color, temperature & sizes

Question 5

A star’s brightness depends on it’s?

Answer 5

Size and temperature

Question 6

The larger and hotter (brigher or dimmer) than smaller and cooler stars

Answer 6

Brighter

Question 7

The measure of star’s brightness is called _________.

Answer 7

Magnitude

Question 8

________ _________- denote a star’s brightness as seen from earth

Answer 8

Apparent magnitude

Question 9

-brightest star= 1st magnitude star
-dimmest star= 6th magnitude star
What does that imply?

Answer 9

The lower the number, the higher the brightness.

Question 10

It is its true brightness irrespective of its distance from the earth

Answer 10

Absolute magnitude

Question 11

Brightness: How bright a star appears (apparent magnitude)
__________: How much light the star is actually giving of (absolute magnitude)

Answer 11

Luminosity

Question 12

Spectral class:
Which class is the hottest and most massive?

Answer 12

Class O

Question 13

Spectral class:
It is the coolest and least massive class.

Answer 13

Class M

Question 14

Spectral class:
What class is our sun?

Answer 14

Class G

Question 15

Name all of the classes from the hottest to the coolest.

Answer 15

O, B, A, F, G, K, M