Motion in the Universe and Cosmology

What does the universe consist of?

• A single galaxy

• An infinite number of stars

• Only the Milky Way galaxy

• Vast, sprawling galaxies each containing billions of stars

What is gravitational field strength (g)?

• The density of a celestial body

• A measure of gravitational acceleration experienced by objects

• The speed of light in vacuum

• A type of magnetic field

What do gravitational forces dictate?

• The color of stars

• The temperature of planets

• The orbits of moons, planets, and satellites

• The size of galaxies

How do the orbits of planets and moons generally appear?

• Perfect circles

• Random patterns

• Elliptical

• Straight lines

What does the orbital speed equation relate?

• The speed of light to time

• The speed of an object in orbit to its orbital radius and the time period for one complete orbit

• The gravitational pull to the mass of the object

• The density of a planet to its gravitational field strength

What does the Big Bang Theory propose?

• Planets are the center of the universe

• The universe is static

• The universe is shrinking

• The universe's origin from a singularity around 13.8 billion years ago

What is the Doppler Effect?

• The effect of black holes on light

• A method to measure the speed of light

• The change in frequency of waves due to the motion of the source

• A type of gravitational pull

What does Red-Shift evidence?

• The cooling of stars

• The universe's contraction

• Galaxies moving away, indicating the universe's expansion

• The birth of new stars

What is the Cosmic Microwave Background Radiation (CMBR)?

• Light from distant galaxies

• Radiation from the Sun

• The afterglow radiation from the Big Bang

• A type of dangerous cosmic radiation

What does the CMBR offer insights into?

• The number of galaxies in the universe

• The future of the universe

• The temperature, density, and composition variations of the infant universe

• The exact size of the universe