According to a new model, days on Earth used to really fly by, and today Pluto has wind-swept dunes made of very weird sand.

Planetary scientist Joel Levine shows some intriguing -- and puzzling -- new discoveries about Mars: craters full of ice, traces of ancient oceans, and compelling hints at the presence, sometime in the past, of life. He makes the case...

It might look like a perfect circle, but the Moon is actually wider than it is tall. Now, new calculations indicate that the Moon’s shape is a remnant of a time when Earth might’ve been covered in a single, global ice sheet.

If we look as far out as possible, we would see a uniform glow of low level radiation in all directions. This is called the cosmic microwave background, or CMB. It is the oldest light in the universe. And it...

Beginning in the late nineteenth century and throughout the twentieth century, geologists, archaeologists and paleoanthropologists have given the world evidence of the physical and cultural development of humans. This video looks at the...

Beginning in the late nineteenth century and throughout the twentieth century, geologists, archaeologists and paleoanthropologists have given the world evidence of the physical and cultural development of humans. This video looks at how...

Beginning in the late nineteenth century and throughout the twentieth century, geologists, archaeologists and paleoanthropologists have given the world evidence of the physical and cultural development of humans. This video looks at the...

Beginning in the late nineteenth century and throughout the twentieth century, geologists, archaeologists and paleoanthropologists have given the world evidence of the physical and cultural development of humans. This video looks at what...

Beginning in the late nineteenth century and throughout the twentieth century, geologists, archaeologists and paleoanthropologists have given the world evidence of the physical and cultural development of humans. This video looks at how...

On Monday, April 16th, NASA is scheduled to launch its newest exoplanet hunter: the Transiting Exoplanet Survey Satellite (TESS).

InSight is lining up to land on Mars. The trip from the top of the atmosphere to the surface of Mars is 6-and-a-half minutes of sheer terror.

Historic Time expands the concept of time C.E. (A.D.) and B.C.E. (B.C.) are also introduced in this informative program that will enhance understanding of historic time. It's About Time Historic Time, Part 2

68% of American families have a pet friend living with them. But why did humans start domesticating animals as pets and not livestock?

Beginning in the late nineteenth century and throughout the twentieth century, geologists, archaeologists and paleoanthropologists have given the world evidence of the physical and cultural development of humans. In this video the...