P7

Question 1

How long does a sidereal day take?

A)22hrs
B)24hrs
C)23hrs, 56 min

Answer 1

C) A sidereal day takes 23hrs 56min

Question 2

Why does the moon appear to take 25hrs to complete one orbit?

Answer 2

Because it orbits in the same direction the Earth rotates

Question 3

What is a lunar eclipse?

A) When the moon blocks the sun
B) When the Earth blocks light hitting the moon
C) When the flash holds a special picnic

Answer 3

B

Question 4

Why are solar eclipses rare?

Answer 4

A solar eclipse requires perfect alignment of the moon in front of the Earth to block the Sun’s light.

The inclination of the moon’s orbit makes this rare.

Question 5

Which planets can be seen with the naked eye?

A) Krypton
B) Saturn and Venus
C) Mercury, Venus, Mars, Jupiter, Saturn.

Answer 5

C

Question 6

Why do planets sometimes appear to have retrograde motion?

A) The earths orbit overtakes theirs
B) Superman pushed them
C) The Sun alters their direction

Answer 6

A

Question 7

What two features are used to describe the position of objects in the night sky?

Answer 7

Right ascension and declination

Question 8

What is declination?

A) A funny kind of food
B) The angle between the celestial equator and the pole star
C) The angle around the celestial equator

Answer 8

B

C refers to right ascension

Question 9

Why are telescopes computer operated?

Answer 9

Enables astronomers to work remotely, precisely and continuously track object, and use computers to record/process data.

Question 10

What factors determine where ground telescopes are placed?

A) High elevation
B) Cloudless nights
C) The avengers are there to protect them
D) Distant from major cities

Answer 10

A,B,D

Question 11

Can space telescopes record different parts of the electromagnetic spectrum? Y or N

Answer 11

Y

Question 12

What are the main disadvantages to space telescopes?

A) High cost of setup and repair
B) Floating space sheep graze on their sensors
C) Light pollution by cities

Answer 12

A

Question 13

Give two examples of international space projects.

Answer 13

The Hubble telescope

The international space station.

Question 14

What is parallax?

Answer 14

When a nearby object observe at two angles appears to change its position relative to a background of distant stars.

Question 15

The period of a cepheid variable is related to

A) It’s luminosity
B) it’s distance
C) it’s battery

Answer 15

A

Question 16

How did Hubble show spiral nebulae were outside the Milky Way?

Answer 16

He calculated the distance to Cepheid variables.

Question 17

What did the universe start with?

A) Speed force
B) A large yawn
C) The Big Bang

Answer 17

C

Question 18

How does the speed of a wave alter when it moves from air to glass?

A) Slows
B) Stays the same
C) Speeds up

Answer 18

A

Question 19

What is the first step in a stars formation?

Answer 19

Gravity collapses a cloud of hydrogen gas.

The decrease in volume increases temperature and pressure.

Question 20

What is the second step of a stars formation?

Answer 20

Hydrogen nuclei are forced close together and fuse.

Fusion releases energy igniting the star.

Question 21

Where does most fusion take place?

Answer 21

In the stars core