A Galaxy Is Observed Receding from Earth with a Speed

question 50

Multiple Choice

A galaxy is observed receding from Earth with a speed of 2800 km/s.If the Hubble constant is 22 km/s per million light-years,estimate how many years ago the light that we presently see from the galaxy actually left the galaxy.(c = 3.00 × 10⁸ m/s,1 ly = 9.461 × 10¹⁵ m,

• A) 1.3 × 10⁸ y
• B) 4.2 × 10⁸ y
• C) 4.2 × 10⁷ y
• D) 1.4 × 10⁷ y
• E) 4.2 × 10⁶ y

---

Definitions:

Subtheory

A division or smaller theory that is part of a larger theoretical framework, often focusing on a specific aspect of the broader theory.

Analytical Intelligence

A facet of intelligence proposed by Sternberg as part of his triarchic theory, involving the ability to analyze, evaluate, judge, compare, and contrast information.

Practical Intelligence

Practical intelligence refers to the ability to solve everyday problems by utilizing knowledge gained from experience rather than purely theoretical or technical understanding.

Reasoning Skills

The capacity to think logically, form sound judgments, and solve problems efficiently.