While less common in our everyday experience on Earth, what is actually the most abundant phase of matter in the universe, found in stars and interstellar space?

Due to the expansion of the universe, light from galaxies beyond a certain distance will never reach us because:

What was the name of the ultra-high-energy cosmic ray detected in 1991, which was traveling so fast that it would have experienced only 16 days since the beginning of the universe?

The Pillars of Creation are a famous formation in which type of celestial object?

Planets that do not orbit a star and instead wander through space are known by what descriptive term?

The Hubble Telescope captured an image of galaxies that appear to form a 'smiley face' due to the bending of light and time caused by strong gravity. What is this effect called?

What are the hypothetical celestial objects theorized to be the opposite of black holes, expelling matter and light rather than absorbing it?

Although the Big Bang occurred roughly 13.7 billion years ago, the diameter of the known universe is much larger. What is the primary reason for this?

In a surprising discovery, which creature was found to use the Milky Way galaxy for navigation?

What surprising fact about Earth and the Milky Way is true?