22.1

Question 1

Stars and planets form from what

Answer 1

nebulas

Question 2

what consists in a nebula

Answer 2

hydrogen and helium with other elements and dust

Question 3

is the collapse of a nebula slow or fast

Answer 3

slow

Question 4

what causes the cloud to flatten

Answer 4

as the cloud spins the rotation slows at the collapse at the equatorial plane

Question 5

stars form when

Answer 5

temp and pressure reach high enough levels for nuclear fusion to begin in the center of the rotating nebula

Question 6

the what became the solar system

Answer 6

rotating disc around the sun

Question 7

how did inner planets form

Answer 7

the elements that were closer to the sun and had a high melting point and formed the smaller rocky planets

Question 8

how did the outer planets form

Answer 8

they were further from the sun and had a lower melting point

Question 9

planetesimal

Answer 9

space object built of solid particles that can form planets through collisions and merges

Question 10

how long is the diameter of a planetesimal

Answer 10

1K-100K+

Question 11

How did planets form

Answer 11

small planetesimals kept colliding with one another

Question 12

debris

Answer 12

material that remained after the formation of the planets and their moons

Question 13

what was claudius ptomleys theory

Answer 13

thought the sun and the planets revolved the earth which was the center point

Question 14

examples of debris that did not become part of a planet

Answer 14

comet meteors and asteroids

Question 15

what was ptomleys theory called

Answer 15

geocentric model

Question 16

retrograde motion

Answer 16

a planets apparent backward movement in the sky

Question 17

could retrograde motion be explained with the geocentric model

Answer 17

no

Question 18

what was nicolaus copernicus theory

Answer 18

his theory was that the sun was the center of the solar system

Question 19

keplers first law

Answer 19

each planet orbits the sun in an elliptical shape

Question 20

keplers second law

Answer 20

planets move faster when close to the sun and slower when farther away

Question 21

keplers third law

Answer 21

the square of the orbital planet is proportional to the cube of the semi major axis of its orbit

Question 22

astronomical unit

Answer 22

earths average distance from the sun