Unit 4 Lesson 1 Galaxy Review

American astronomer Edwin Hubble devised a system that categorizes galaxies by size and shape. Hubble’s system, when represented visually, looks like a tuning fork. He created this system after recording observations, also known as empirical evidence, on the physical appearances and features of galaxies. What technology did Hubble use to collect this empirical evidence?

• Microscope

• Telescope

• Tuning Fork

• Binoculars

Answer explanation

Edwin Hubble used a telescope to observe features of galaxies. He recorded these observations as empirical evidence to support his Categorization of Galaxies System.

What are the three major types of galaxies?

• spiral, circular, and disk

• irregular, lenticular, and spiral

• spiral, elliptical, and irregular

• spiral, disk, and undefined

What are the features of a spiral galaxy?

• disk shape, young stars, little to no dust, and where we live

• undefined shape, middle-aged stars, and where we live

• round or flat sphere, old stars, a lot of dust, and where we live

• disk shaped, middle-age stars, some gas/dust, and where we live

Tags

NGSS.MS-ESS1-2

What are the features of an irregular galaxy?

• disk shape, young stars, little to no dust

• undefined shape, young stars, lots of gas/dust

• round or flat sphere, old stars, a lot of dust

• disk shaped, middle-aged stars, some gas/dust

What are the features of an elliptical galaxy?

• disk shape, young stars, a lot of dust

• undefined shape, young stars, lots of gas/dust

• round or flat sphere, old stars, little to no dust

• disk shaped, middle-aged stars, some gas/dust

Scientists know that 1 trillion galaxies make up the observable universe, but what is the role of gravity in the universe? Select the best answer choice.

• Gravity is the force that holds us onto Earth.

• Absence of gravity is the force that causes objects to float in outer space.

• Gravity is the force of any object that has mass.

• Gravity is the force that holds planets, stars, and celestial bodies in orbit in a galaxy.

Tags

NGSS.HS-ESS1-4

NGSS.HS-PS2-4

What is the most accurate number of galaxies and stars that we know exist?

• there are billions of galaxies with billions of stars

• there is one hundred galaxies each with a billion stars

• there are a thousand galaxies each with a million stars

• there is one million galaxies each with a billion stars

How were scientists able to determine the heliocentric model of the solar system was more accurate than the geocentric model of the solar system?

• the creation of the telescope allowed scientists to perform observational investigations and record empirical data

• the creation of binoculars helps astronomers to more clearly evaluate planets in the sky

• the microscope allowed scientists to study asteroids and pieces of planets

Tags

NGSS.MS-ESS1-2

NGSS.MS-ESS1-3

What type of galaxy do we live in and what is it called?

• Andromeda M31 and spiral galaxy

• Milky Way Galaxy and spiral galaxy

• Sunflower Galaxy and spiral galaxy

• Pinwheel Galaxy and spiral galaxy

Observational investigations allow scientists to collect data in the form of empirical evidence by recording observations. Why might an astronomer perform an observational investigation?

• to control the independent and dependent variables of an experiment

• to observe features such as size, shape, and behavior of comets, planets, or galaxies