Big Bang Theory and Stellar Evolution

How old is the universe?

• 13.8 million years
• 12.8 million years
• 12.8 billion years
• 13.8 billion years

Hubble observed that galaxies are

• expanding
• moving away from us
• moving towards us
• standing still

What can we conclude from the observation that nearly all galaxies are moving away from us?

• Massive black holes are drawing galaxies away from Earth.
• The Sun and Earth are located at the center of the universe.
• Everything in the universe is moving the same direction.
• The once-smaller universe is expanding in all directions.

The Hubble constant measures the

• current expansion rate of the universe
• the universe began in a hot, dense state
• curvature of space in the universe
• temperature of the universe

In red shift, the wavelengths of light become

• Bluer
• shorter
• longer

The theory that explains the formation of the solar system is called ____.

• Nebulis Theory
• Nebular Theory
• Big Bang Theory
• Big Nebulan Theory

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 much of the nebula matter became the Sun?

• 33%
• 66%
• 99%
• 77%

How long ago did the solar system begin to form?

• 4.6 billion years ago

• 50 million years ago

• 4.6 million years ago

• 13 billion years ago

A cloud of gas and dust from which bodies in space are formed

• photosphere
• nebula
• solar flare
• Sunspot