Year 10 Earth and Space Revision

Which statement is true?

• The galaxies are moving toward us.

• The galaxies are moving away from us.

• The universe remains static or unchanged in motion.

• None of the above

Galaxies that are redshifted are:

• actually blue.
• really far away.
• invisible.
• moving away from us.

The universe is expanding!  This means that:

• all of the galaxies are spreading out.
• the universe must have started from a single point.
• the universe is cooling down.
• all of the above.

The Cosmic Background Radiation is:

• the remaining energy from the big bang.

• incredibly hot.

• visible to the human eye.

• only located in certain places in the universe.

An infinitely small, infinitely dense, and infinitely hot point that is believed to have existed before the big bang.

• Singularity

• Antimatter

• Little bang

• condensation nuclei

What type of radiation in the universe is believed to the residue of the early universe?

• cosmic background microwave

• infrared rays

• radio waves

• ultraviolet waves

What does the big bang theory explain?

• redshift phenomenon

• relationship of distance and velocity

• the origin of heavenly bodies

• the origin of the universe

What is the central idea of the big bang theory?

• All matter in the universe started

  at a single point of origin.

• As the universe continues to

  expand, it will eventually

  collapse.

• When two or more galaxies

  collide, a big bang occurs.

• The current universe is at its

  original location of the cosmic

  explosion.

What is Light Year?

• The distance travelled by light in a second

• The distance travelled by light in a minute

• The distance travelled by light in a year

• The distance travelled by light in a decade

Light Years are a measure of:

• time
• speed
• distance
• light