The Expanding Universe

Front

The initial explosion that resulted in the formation and expansion of the universe is called _____________.

Back

the Big Bang

Front

What were the original two elements in our universe?

Back

Hydrogen and Helium

Front

In which direction are nearly all galaxies moving?

Back

away from each other

Front

If a star is being observed from Earth and its light has shifted towards the blue side of the electromagnetic spectrum, it would be...

Back

Moving towards the Earth

Front

When did the big bang occur?

Back

13.7 billion years ago

Front

What is the term for the phenomenon where light from an object moving away from an observer shifts to longer wavelengths?

Back

Redshift

Front

What is the term for the phenomenon where light from an object moving towards an observer shifts to shorter wavelengths?

Back

Blueshift

Front

What is the primary evidence for the Big Bang theory?

Back

Cosmic Microwave Background Radiation (CMB) and the observed redshift of galaxies.

Front

What does Hubble's Law state?

Back

The farther away a galaxy is, the faster it is moving away from us.

Front

What is dark energy?

Back

A mysterious force that is causing the acceleration of the universe's expansion.