Test 1 Practice

Galaxies that move closer to us show a what shift?

• Red Shift
• Green Shift
• Orange Shift
• Blue Shift

In relation to us, most galaxies are…

• Moving toward us
• Moving away from us
• Not moving

The change in wavelength of light or sound that is due to the relative motion of the source towards or away from an observer.

• Radar Effect
• Doppler Effect
• Light Effect
• Reflection

What does the Big Bang theory suggest?

• The universe was just there
• The Milky Way is the only solar system
• The universe is continually expanding
• The universe started as a point and is moving towards each other

Who discovered that the galaxies were moving away from one another?

• Edwin Hubble
• Issac Newton
• Albert Einstein
• Galileo Galile

A force of attraction between any two objects is called _____________.

• static electricity 
• rotation
• gravity
• orbit

Earth and the other planets closest to the Sun are made mostly of _______

• gas
• metal
• water
• rock

the planets of the solar system formed as 

• the center of the gas cloud cooled
• planetesimals flattened into a rotating disk
• planetesimals collided into one another
• the sun absorbed extra gas and dust from the solar system

How long ago was our sun formed?

• 10 million years ago
• 5 million years ago
• 4.5 billion years ago
• 2 billion years ago

What force acted on the massive nebula to collapse it and eventually form our sun?

• electrostatic force
• strong force
•  weak force
• gravity