In 2013, astronomers discovered the Huge Large Quasar Group (LQG), a massive structure of quasars 9 billion light years away, challenging the cosmological principle which suggests no structures larger than 1.5 billion light years should exist. The discovery sparked debate about the universe's structure, with some scientists questioning the methods used and others suggesting the LQG might not violate the principle. The possibility of even larger structures, like the Hercules-Corona Borealis Wall, further complicates the understanding of the universe's large-scale structure.

What is the cosmological principle's prediction about the size of cosmic structures?

• They should be smaller than 500 million light years.

• They can vary greatly in size without any limit.

• They should not exceed 1 and 1/2 billion light years.

• They can be as large as 4 billion light years.

What was the significance of the Huge Large Quasar Group discovered in 2013?

• It was found to be a statistical error.

• It was the first quasar group ever discovered.

• It was the largest known structure in the universe at the time.

• It confirmed the cosmological principle's predictions.

How do large quasar groups challenge the cosmological principle?

• They do not exist according to current data.

• They are evenly distributed across the universe.

• They are larger than the predicted limit.

• They are smaller than predicted.

What alternative explanation is suggested for the size of the Huge LQG?

• It is a statistical anomaly.

• It is a new type of cosmic structure.

• It is a result of measurement errors.

• It is a temporary formation.

What is the Hercules-Corona Borealis Wall?

• A small group of quasars.

• A potentially larger structure than the Huge LQG.

• A new type of galaxy.

• A confirmed violation of the cosmological principle.