In 2006, the International Astronomical Union (IAU) decided that a large celestial object is a planet only if its gravitational orbit around the sun makes it round and if it’s big enough to ...

So, what does famed astrophysicist Neil deGrasse Tyson have to say to these people ... explains why it makes perfect sense to classify Pluto as a dwarf planet. Produced by Kamelia Angelova ...

Astrophysicist Neil deGrasse Tyson and SpaceX CEO Elon Musk have made scathing comments about each other online.

The International Astronomical Union has downgraded Pluto to that of dwarf planet. Neil deGrasse Tyson AP “I did troll him with Pluto. I trolled him because he gives Pluto no credit. I’m going ...

The renowned astrophysicist will discuss science in the context of a number of classic films in Phoenix next summer.

He may or may not be buying MSNBC, but Elon Musk isn't taking any put-downs from Neil de Grasse Tyson on his Mars ambitions.

So, what does famed astrophysicist Neil deGrasse Tyson have to say to these people ... explains why it makes perfect sense to classify Pluto as a dwarf planet. Produced by Kamelia Angelova ...

So, what does famed astrophysicist Neil deGrasse Tyson have to say to these people ... explains why it makes perfect sense to classify Pluto as a dwarf planet.