4.15 Unit Test: Universe and the Solar System

The big bang theory states that the universe is approximately _________.

Which number best completes the sentence?

• 14 thousand years old

  
  

• 14 million years old

  
  

• 14 billion years old

  
  

• 14 trillion years old

  
  

Answer explanation

The big bang theory posits that the universe is approximately 14 billion years old, making '14 billion years old' the correct choice. The other options are significantly lower than the scientifically accepted age.

Tags

NGSS.HS-ESS1-2

Which statement tells a result of the big bang?

• Galaxies are moving closer.

  
  

• Galaxies are moving farther away.

  
  

• Galaxies are stationary.

  
  

• Galaxies are moving randomly.

  
  

Answer explanation

The correct statement is 'Galaxies are moving farther away.' This is a result of the big bang, indicating that the universe is expanding, as observed through redshift in distant galaxies.

Tags

NGSS.HS-ESS1-2

What is a cloud of dust and gas in space known as?

• an asteroid

  
  

• a nebula

  
  

• a galaxy

  
  

• a solar system

  
  

Answer explanation

A cloud of dust and gas in space is known as a nebula. Nebulae are often the birthplaces of stars and can be observed in various shapes and colors, unlike asteroids, galaxies, or solar systems.

What did the solar system form from?

• preexisting planets

  
  

• comets

  
  

• black hole

  
  

• clouds of dust and gas

  
  

Answer explanation

The solar system formed from clouds of dust and gas, known as the solar nebula. This material collapsed under gravity, leading to the formation of the Sun and the surrounding planets, making this the correct answer.

Tags

NGSS.HS-ESS1-6

Which galaxy is called a barred-spiral galaxy?

• 
• 
• 
• 

Tags

NGSS.MS-ESS1-2

Alpha Centuri is 4 light years from Earth.

How long would it take for light from Alpha Centuri to reach Earth?

• 4 Earth years

  
  

• 4 Earth months

  
  

• 4 Earth weeks

  
  

• 4 Earth days

  
  

Answer explanation

Light travels at a speed of 1 light year per year. Since Alpha Centauri is 4 light years away, it takes 4 Earth years for light from Alpha Centauri to reach Earth. Therefore, the correct answer is 4 Earth years.

What happens to the force of gravity between two masses if they are moved closer?

• It increases.

  
  

• It decreases.

  
  

• It stays the same.

  
  

• It fluctuates.

  
  

Answer explanation

The force of gravity between two masses increases as they are moved closer together. This is due to the inverse square law, which states that gravitational force is inversely proportional to the square of the distance between the masses.

Which choice states the planet or planets that have an elliptical orbit around the sun?

• Earth

  
  

• Jupiter

  
  

• Mars

• Earth, Jupiter, and Mars

  
  

Answer explanation

All planets in our solar system, including Earth, Jupiter, and Mars, have elliptical orbits around the sun, as described by Kepler's laws of planetary motion. Therefore, the correct choice is 'Earth, Jupiter, and Mars'.

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

What separates Mars from Jupiter?

• sun

  
  

• Milky Way Galaxy

  
  

• asteroid belt

  
  

• black hole

  
  

Answer explanation

The asteroid belt is the region of space that separates Mars from Jupiter. It consists of numerous rocky bodies and is located between the orbits of these two planets.

What is caused by the tilt of the Earth on its axis?

• day and night

  
  

• the seasons

  
  

• a year

  
  

• a month

  
  

Answer explanation

The tilt of the Earth on its axis is responsible for the changing seasons. As the Earth orbits the Sun, different areas receive varying amounts of sunlight throughout the year, leading to seasonal changes.

Tags

NGSS.MS-ESS1-1