Formation & Motion of Galaxies

What is the primary component of a galaxy?

• Only asteroids and dust

• Unidentified objects that can be seen using powerful telescopes

• Multiple stars larger than our sun

• Billions of stars and things that orbit them held together by gravity

What holds objects and systems in the universe together?

• The Sun

• Infrared radiation

• Star clusters

• Gravity

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What is the estimated age of the universe?

• 13.7 billion years

• 30 billion years

• 13.8 million years

• 4.5 billion years

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What is the most widely accepted theory about how the universe was formed?

• Steady State Theory

• Universe Formation Theory

• Big Blast Theory

• Big Bang Theory

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What observation led Edwin Hubble to conclude that the universe is expanding?

• He noticed that the stars are getting bigger over time

• He observed that the light from distant galaxies is blue shifted

• He observed that the light from distant galaxies is red shifted

• He found that galaxies are leaving a trail of dust and debris as they move away

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What is the expected motion of planets in a newly formed solar system?

• The planets will revolve around the star while also rotating on their own axis

• The planets will revolve around the galaxy's central black hole, not the star

• The planets will revolve around the star, but will not rotate on their own axis

• The star will orbit around the planets, which will be situated in the center

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What causes celestial bodies in the universe to spin and orbit?

• The spin and orbit of celestial bodies are a result of the gravitational pull of larger bodies and the initial momentum from the collapse of dust and gas clouds

• Celestial bodies do not spin or orbit in the universe

• Unique magnetic fields in the universe cause celestial bodies to spin and orbit

• There is no scientific explanation for the spin and orbit of celestial bodies in the universe

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What process led to the creation of the planets in our solar system?

• Planets were formed from the debris of a supernova explosion

• Planets were formed from the cooling and solidification of stars

• Planets were formed from the gravitational pull of gas and dust in a rotating disk

• Planets were formed from the fragmentation of a larger celestial body

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What process led to the formation of planets in our solar system?

• Planets were formed from the leftover dust and gas that didn't become part of the Sun

• Planets were formed from the remnants of a supernova explosion

• Planets were formed from the gases produced by the Sun's nuclear fusion

• Planets were formed from the nebulae surrounding the Sun

What causes the rotation of objects around the center of a galaxy?

• The gravitational pull from the densely packed stars and possibly a massive black hole at the center of the galaxy

• The objects in the center are tightly packed and constantly collide with each other

• The repulsion from a giant black hole at the center of the galaxy

• The center of the galaxy has the highest number of planets

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