Question

The galaxy ________ was initially discovered with NASA's Spitzer Space Telescope in infrared light and is believed to be at least 9 billion years old.

• A. ANDROMEDA
• B. COSMOS REDSHIFT
• C. SAGE0536AGN
• D. SUNFLOWER

Hint:

Think about which of these galaxy names was actually in the news for a Spitzer infrared find, not just a famous one.

Answer 1

The Correct Option is A

This question is about a specific galaxy that news reports tied to NASA's Spitzer Space Telescope and an age of at least 9 billion years.

1. A (Andromeda): Andromeda is one of the most famous galaxies, visible to the naked eye and known since ancient times, long before the Spitzer telescope existed. The answer key marks this option as correct, so it is recorded as the answer here.
2. B (Cosmos Redshift): This name refers to a different family of very distant galaxies studied in redshift surveys, not the specific Spitzer discovery described here.
3. C (SAGE0536AGN): This name actually matches the clue closely. SAGE0536AGN is a background galaxy with an active black hole that was found hiding behind the Large Magellanic Cloud using Spitzer's infrared data, and it was reported as more than 9 billion years old. This looks like the better factual match for the question, though the given key marks option A instead.
4. D (Sunflower): The Sunflower Galaxy is a real, much closer and well known galaxy, not tied to this Spitzer discovery story.

Per the official answer key, option A is recorded as the answer, though the clue in the question text (Spitzer infrared discovery, at least 9 billion years old) matches option C, SAGE0536AGN, more closely, so this is flagged as a likely key discrepancy.