The observable universe is a ball-shaped region of the universe comprising all matter that can be observed from Earth or its space-based telescopes and exploratory probes at the present time, because ...

According to a tenet scientists call the cosmological principle, our place in space is in no way exceptional. But recent ...

Over 40 stars in a galaxy billions of light-years away were photographed, offering a glimpse into an era when the universe ...

This is just a small part of the universe—less than 1% of the entire observable universe—but it is our galactic neighborhood. And it is good to know the geography of your neighborhood.

Imagine discovering the universe’s most powerful explosion, an event so significant that it won the Nobel Prize in Physics. This video dives into the moment scientists first detected ...

5. Because of the finite speed of light, we are restricted to studying our observable universe. Discuss with your class the question, "Are there other universes?" What hypotheses can they make?