Astronomy Cosmology and Deep Space 4

Question 1

The relationship between a galaxy's distance and its recession velocity is known as:

Accepted Answer

Hubble's Law

Answer

Hubble's Law states that recession velocity is proportional to distance.

Question 2

What were the first elements formed in significant amounts shortly after the Big Bang?

Accepted Answer

Hydrogen and helium

Answer

Big Bang nucleosynthesis produced mostly hydrogen and helium, with a trace of lithium.

Question 3

Gravitational lensing occurs when:

Accepted Answer

Massive objects bend light from more distant sources

Answer

A massive foreground object warps spacetime, bending and magnifying light from behind it.

Question 4

The discovery that the universe's expansion is accelerating was based on observations of:

Accepted Answer

Distant Type Ia supernovae

Answer

Type Ia supernovae served as standard candles revealing that expansion is speeding up.

Question 5

What is the cosmic web?

Accepted Answer

The large-scale filamentary structure of galaxies and dark matter

Answer

The cosmic web is the vast network of filaments, walls, and voids that organizes matter in the universe.

Astronomy Practice Test