There's a Giant Hole in the Universe

In 2004, researchers discovered a cold spot in the universe using WMAP data. This anomaly, found in the cosmic microwave background (CMB), is a region significantly colder than its surroundings. The CMB is the remnant radiation from the Big Bang, and its temperature variations are usually minimal. The cold spot's unusual temperature drop led to various theories, including errors in data analysis and the presence of a supervoid—a massive, less dense region of space. Recent studies suggest the cold spot may indeed be linked to a supervoid, but this only accounts for a fraction of the temperature anomaly, leaving much of the cold spot's nature unexplained.

Discuss the possible explanations scientists have proposed for the existence of the cold spot.

What conclusion did researchers reach regarding the temperature drop in the cold spot, and what remains unexplained?