Unit 2 Quiz #2

What are small bodies (objects) which planets originate from during the early development of a Solar System?

• Planetesimals

• Protostars

• Solar Nebulae

• Protoplanetary Disks

Planets originated from​ (a)   ​. As they grew in size and mass, they turned into​ (b)   before eventually becoming planets.

• planetesimals
• protoplanets
• rocks
• boulders
• asteroids

What separates the inner planets from the outer planets?

• Asteroid belt

• Kuiper belt

• Oort cloud

• Nebular belt

Put the statements into the correct category.

Groups:

(a) Inner Planets

,

(b) Outer Planets

• Heavier substances like iron and silicates

• Less dense

• Solid surface

• More dense

• Lighter substances like hydrogen, helium, and methane

• Warmer and drier

• Colder and icy

• Mostly gases

Tags

NGSS.MS-PS1-1

The Solar System was primarily made of which TWO elements when it first began forming? (Mark TWO answers)

• Hydrogen

• Helium

• Oxygen

• Iron

Tags

NGSS.HS-ESS1-6

Based on evidence we currently have, it is believed that the Solar System is around​ (a)   years old.

• 5 million

• 500,000

• 13 billion

• 5 billion

Tags

NGSS.HS-ESS1-6

Put the important events of Solar System formation in the correct order.

• Material at the center of the disk warms, forming a ball of hot gas called a protostar

• Heat and solar wind pushes lighter material further away from the center, planets have formed

• The cloud begins to spin and flatten forming an protoplanetary disk

• Small particles of gas, dust, and ice begin to clump together and grow in size forming protoplanets

• A solar nebula, begin to collapse due to gravity and other forces

What is accretion?

• A growth or increase in size by gradual addition of material.

• A spinning and flattening of a cloud of gas.

• When a substance easily evaporates at low temperatures.

• A stream of high-energy particles pushing material away.

TRUE or FALSE: when two objects combine, this will create a new object that is double the size of the original objects.

• True

• False

What are TWO pieces of evidence for the current theory for the formation of the Solar System? (Select TWO answers)

• All the planets orbit in the same direction that the Sun rotates.

• All the planets are made of the same elements and materials.

• Images of other stars show disks of gas and dust circled around them.

• Mass is evenly distributed across the whole Solar System.