Photosynthesis changed Earth in powerful ways. When photosynthetic organisms appeared, it led to the Great Oxygenation Event.

What is a brown dwarf star? These formations often defy classification, blurring the line between planets and stars.

For observers in India, Neptune will be visible throughout most of the night on September 20-21, rising in the east just as ...

A roundup of the day’s news including local astronomers working with Nasa to find out more about dwarf planet Pluto.

If you are going to look for intelligent life beyond Earth, there are few better candidates than the TRAPPIST-1 star system.

Mexico, N.Y. – Malaki Sandejas, 8, loves a dwarf planet. Sitting next to his mom on their couch, he rattles off the five in our solar system. “The dwarf planets are Haumea, Makemake, Eris, Ceres and ...

R esearchers looking for objects in the Kuiper Belt – the donut-shaped region beyond the orbit of Neptune containing icy ...

Starting Saturday, more than 200 new laws will take effect in Arizona. Here’s a breakdown of seven laws about topics from ...

Starstruck Billions of years ago, our Solar System may have had an incredibly close encounter with another passing star. As ...

Neil deGrasse Tyson shared exclusively with PEOPLE at the 'Speak No Evil' premiere that former elementary school students are still 'angry' at him as adults for his role in determining what ...