Unit 13 Review

What galaxy do we live in?

• Andromeda Galaxy

• Milky Way Galaxy

• Solar system

• Triangulum Galaxy

Answer explanation

We live in the Milky Way Galaxy. It is composed of billions of stars, gases, and dust. It is classified as a flattened-spiral galaxy.

How are stars arranged?

• Evenly

• Unevenly

Answer explanation

Stars are unevenly distributed in space. They are grouped in clusters held together by gravity.

How are galaxies classified?

• By their shape

• By their size

• By their age

• By their color

What are the 3 main types of galaxies?

• Comets, Asteroids, Nebulae

• Large, Medium, Small

• Planets, Moons, Stars

• Spiral, Elliptical, Irregular

How to you compare galaxies?

• By their size and brightness

• By their shape and composition

• By their age and distance

• By their color and speed

Which is a type of galaxy?

• Lenticular

• Nebula

• Quasar

• Supercluster

What does the Big Bang Theory (BBT) state?

• That an explosion created humans on Earth.

• That the universe is small

• That everything in the universe was once concentrated into one dense point that expanded outwards

• That nothing existed at the start of the universe

Answer explanation

The Big Bang Theory states that everything that would become all the energy, matter, and space in the universe was once concentrated into one dense point that expanded outward, forming the universe.

Tags

NGSS.HS-ESS1-2

Which of these is the smallest?

Galaxy, Universe, Solar system, Dwarf planets, Stars, Planets, Nebulae, Comets, Moons, Asteroids

• Dwarf planets

• Moons

• Universe

• Asteroids

What does the Steady State Theory declare?

• That Earth is the only planet with life in the universe

• That the universe is not real

• That the universe is essentially changing

• That the universe is essentially unchanging

Answer explanation

The SST states that the universe is essentially unchanging. Matter is continuously being created as old celestial bodies move apart. It doesn't give the universe an age and states that it has always been the way it is now. (no evolution)

What does the Nebula Gas Theory state?

• That the solar system formed from a nebula

• That the universe was created from a single point

• That the solar system is not held together by gravity

• That the Earth is the center of the universe

Answer explanation

The Nebula Gas Theory (NGT) states that the solar system formed from a giant cloud of molecular hydrogen, dust, and helium. (Nebula) Because all nebulae rotate, their gases and dust particles move around a central point.