mesurments ans star properties

Question 1

What is an astronomical unit (AU)?

Answer 1

An astronomical unit is the distance between the Earth and the Sun (150,000,000 km).

Question 2

How many astronomical units are in a light year?

Answer 2

1 light year = 63,241 AU.

Question 3

What is the relationship between astronomical units and miles?

Answer 3

1 light year: 1 AU is comparable to 1 mile: 1 inch.

Question 4

Why are distances outside of the solar system too big to use AU?

Answer 4

Distances outside of the solar system are too big to use AU as a form of measurement.

Question 5

What is a parsec?

Answer 5

A parsec is a unit of measurement based on parallax and trigonometry.

Question 6

What is parallax?

Answer 6

Parallax is an angle based on the apparent change of position of a celestial object.

Question 7

How many light years are in a parsec?

Answer 7

1 Parsec = 3.26 light years.

Question 8

what is the next closest star to earth after the sun?

Answer 8

próxima centauri

Question 9

how far away is próxima centauri?

Answer 9

4.22 light years away

Question 10

how much distance is there between the milky way and andromeda galaxy?

Answer 10

2.5 million light years

Question 11

the edge of the milky way is located approximately

Answer 11

25000 light years from earth

Question 12

1 light year=

Answer 12

distance light travels in 1 year

Question 13

speed of light:

Answer 13

3.0x10 8 m/s

Question 14

every star in the observable universe has unique properties such as…

Answer 14

1. brightness
2. colours
3. temperature
4. mass
5. composition

Question 15

describes the brightness of a star….

Answer 15

luminosity

Question 17

what is luminosity a measure of?

Answer 17

the total amount of energy the stars give off per secound