Review 2

Question 1

Who determined that planets orbit in ellipses, and not in circles?

Answer 1

Kepler

Question 2

What is the ‘point of no return’ of a black hole called?

Answer 2

event horizon

Question 3

Which process allows energy from the sun to reach the Earth?

Answer 3

radiation

Question 4

When fusion begins in a high mass protostar, which kind of star is formed?

Answer 4

blue star.

Question 5

How are mass and luminosity related?

Answer 5

Larger mass implies more luminosity

Question 6

About how many stars does an average galaxy contain?

Answer 6

100 billion

Question 7

Who first attached a spectroscope to a telescope to study the spectrum of stars?

Answer 7

Angelo Secchi

Question 8

What is believed to be at the center of most galaxies?

Answer 8

supermassive black holes

Question 9

What is another name for a ‘shooting star?’

Answer 9

Meteor

Question 10

Who proposed that temperatures at the core of the sun were hot enough for thermonuclear fusion?

Answer 10

Arthur Eddington

Question 11

How long does it take our sun to revolve around the center of the Milky Way galaxy?

Answer 11

200,000,000 years

Question 12

What is the dimmest magnitude star that can be seen with the naked eye?

Answer 12

+6

Question 13

Which satellite is the largest one in the Solar System?

Answer 13

Ganymede

Question 14

Which of the following describes how bright a star appears to an observer on Earth?

Answer 14

apparent magnitude

Question 15

The sun shines most directly on the Tropic of Cancer on which day? (Northern Hemisphere)

Answer 15

summer solstice

Question 16

There are certain gaps in the Asteroid Belt caused by Jupiter’s gravity. What are these gaps called?

Answer 16

Kirkwood gaps

Question 17

Who devised a method to measure the circumference of the Earth?

Answer 17

Eratosthenes

Question 18

How many times brighter is a magnitude +1 star than a magnitude +2 star?

Answer 18

2 ½ times brighter

Question 19

What is the difference between a meteoroid and an asteroid?

Answer 19

Meteoroids are small; asteroids are large.

Question 20

Which kind of star allows astronomers to estimate the distance to galaxy up to about 15 million light-years away?

Answer 20

Cepheid variable stars

Question 21

Which two gasses is Jupiter mostly made up of?

Answer 21

hydrogen & helium

Question 22

Which color of light has the lowest frequency?

Answer 22

red

Question 23

Which lunar phase occurs immediately after full moon?

Answer 23

waning gibbous

Question 24

What is the solid part of a comet called?

Answer 24

nucleus

Question 25

Why doesn’t Venus have a magnetic field like the Earth?

Answer 25

Venus does not rotate fast enough.

Question 26

Where did the majority of stars fall on the H-R diagram?

Answer 26

main sequence

Question 27

What is the region called where most of the comets reside?

Answer 27

Oort cloud

Question 28

Who discovered 228 asteroids in the early 1890s by using photographic techniques?

Answer 28

Max Wolf

Question 29

What is the name of Pluto’s satellite?

Answer 29

Charon

Question 30

Which stage of development is the sun at?

Answer 30

yellow star

Question 31

Which method allows us to estimate the distance to the furthest galaxies observable?

Answer 31

Brightest galaxy in cluster

Question 32

To which galactic cluster does our solar system belong?

Answer 32

Local Group

Question 33

What are the four categories that galaxies are classified in?

Answer 33

spiral, barred spiral, elliptical, and irregular