Formation of Planetary Systems

The fact that all of the planets orbit in the same direction as the Sun rotates indicates that

• the solar system is 5 billion years old.

• there is no such thing as retrograde motion.

• they all formed at about the same time & relative space.

• Pluto may have formed somewhere else.

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NGSS.HS-ESS1-4

A ____ is a cloud of gas & dust that has contracted under gravity to form a star & planets.

• nebula region

• hydrogen dust field

• solar nebula

• galaxy

According to the condensation theory, the Sun formed at the center of a nebula cloud with

• the planets, asteroids, comets etc. forming as leftovers.

• a mass that is just a little less than the planets etc.

• a mass that is equivalent to the rest of the solar system.

• Jupiter almost attaining enough mass to become a star.

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NGSS.HS-ESS1-1

Why do most astronomers think the condensation theory of solar system formation is correct?

• it is the only theory currently available

• the star system Beta Pictoris is an example

• various stages of solar system formation have been observed

• they don't really think it's correct - just a best guess

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NGSS.HS-ESS1-6

The ​ (a)   ​ ​ (b)   force pulled ​ (c)   and other debris together to ​ (d)   the ​ (e)  

• sun's

• gravitational

• rocks

• form

• planets

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NGSS.HS-PS2-4

The solar system formed out of a ​ (a)   of gas and dust. That nebula, started forming about ​ (b)   billion years ago. As the nebula contracted, it's speed ​ (c)   . ​ (d)   started to occur, and that is the beginning of our star: the Sun.

• nebula

• 4.6

• increased

• Nuclear Fusion

• disk

• 150

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HS-ESS1-B

​ (a)   is the process in which planets grew from space dust, to planetesimals to planets.

• Accretion

• Formation

• Evolution

When did the sun form?

• 4.6 billion years ago

• 2.6 billion years ago

• 46 years ago

• 5 million years ago

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NGSS.HS-ESS1-1

Many small, moon-like bodies collided to form the inner planets. They are known as _____.

• meteors

• asteroids

• planetesimals

• small moons

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NGSS.MS-ESS1-3

Astronomers use _____ of the origin of the solar system based on current observations.

• scale drawings

• models

• experimental theories

• their knowledge

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NGSS.HS-ESS1-2