In the Verification of the Hubble Law for the Expansion

question 67

Multiple Choice

In the verification of the Hubble law for the expansion of the universe and the determination of the constant H₀, the greatest difficulty has been

• A) allowance for gravitational redshifting of light by high gravitational fields at distant galaxies.
• B) accurate determination of distances to very distant galaxies.
• C) measurement of recession velocities of distant galaxies by Doppler shift.
• D) the identification of distant objects as galaxies, rather than very bright, nearby stars.

---

Definitions:

Myofibrils

Long structures that fill the sarcoplasm of a muscle fiber.

Striations

Bands produced from the arrangement of filaments in myofibrils in skeletal and cardiac muscle cells.

Aerobic Respiration

A process of energy production in cells involving oxygen to break down food molecules and produce ATP.

Muscle Pigment

Substances produced in the body that give color to muscle tissues, such as myoglobin, which is responsible for the red and brown colors of muscles.