Could we have a possible 9th Planet? Hank Green tells us what we think we know with this elusive object.

The planets in our solar system have a very specific order. But have you wondered why they have the order they do?

Four rocky inner planets and four gaseous outer planets - makes sense, right? But when astronomers turned their eyes to planets beyond our star system they found out that many systems are set up differently. Why?

With a recent announcement from the UN Office for Outer Space Affairs, the doors to space research have been opened for many new countries.

Neptune is the farthest planet from the sun in our solar system. It has 14 known moons and five rings. Learn more about Neptune and its climate.

You know what a planet is, right? A big round thing that orbits a star. Uh, not so fast. The surprisingly vicious debate over the planetary status of Pluto has given us a fascinating glimpse into what a scientific definition really is....

Some funky orbits near the Kuiper Belt are hinting towards a brand new planet, the elusive ‘Planet X.’ Our friends Mike Brown and Konstantin Batygin of Caltech are working hard to finally spot the potential gas giant through powerful...

"We will start inhabiting outer space," says Angelo Vermeulen, crew commander of a NASA-funded Mars simulation. "It might take 50 years or it might take 500 years, but it's going to happen." In this charming talk, the TED Senior Fellow...

I’m going to tell you about the craziest proposal for an astrophysics mission that has a good chance of actually happening. A train of spacecraft sailing the sun’s light to a magical point out there in space where the Sun’s own gravity...

Students are taken on an exciting animated trip to the outer reaches of our solar system. Images from NASA and the Hubble space Telescope illustrate the Giant Red Spot on Jupiter, Saturns' beautiful rings, the tilted rings of Uranus, and...

Students are taken on an exciting animated trip to the outer reaches of our solar system. Images from NASA and the Hubble space Telescope illustrate the Giant Red Spot on Jupiter, Saturns' beautiful rings, the tilted rings of Uranus, and...

The use of direct and indirect proportion in navigating the Voyager spacecraft to the outer planets. Maths - Number A Twig Math Film. Reinforce and extend the learning required by the curriculum. Twig’s context films show abstract...

What the astronauts felt when they saw earth from space changed them forever. Author and artist Benjamin Grant aims to provoke this same feeling of overwhelming scale and beauty in each of us through a series of stunning satellite images...

No, technically Earth doesn't orbit the Sun. Yes, technically sound can travel through space. Over the years we've built up a lot of myths and misconceptions about astronomy. But of course some are more flat-out false than...

On Sept. 18, 1977, NASA's Voyager 1 spacecraft took a photo of Earth and the moon.



It was the first time both the Earth and the moon were captured in a single frame. At the time, Voyager 1 was more than 7 million miles away...

On July 9, 1979, NASA's Voyager 2 spacecraft made its closest approach to Jupiter. It came within 354,000 miles (570,000 kilometers) of the planet's cloud tops. Voyager 2 was one of two space probes launched by NASA in 1977 to study the...

In the 1970's, no vehicle had gone beyond the asteroids between Mars and Jupiter, that is until Pioneer 10.

Learn why Pluto was once considered a planet but is now classified as a dwarf planet. The video discusses the discovery of the Kuiper Belt and the debates that led to the reclassification of Pluto.

Dr. Forrester explains how scientists over the centuries have used a variety of tools to gaze into outer space.

In this video, Nova takes children on an exciting adventure through outer space to explore the universe of technology. They learn about the meaning of technology and how it helps solve problems and make tasks easier. Nova introduces...

In this video, the topic of discussion is the Kuiper Belt, a region in our solar system that extends from the orbit of Neptune. It is similar to the asteroid belt but much larger, and is home to three recognized dwarf planets, including...

Students are taken on an exciting animated trip to the outer reaches of our solar system. Images from NASA and the Hubble space Telescope illustrate the Giant Red Spot on Jupiter, Saturns' beautiful rings, the tilted rings of Uranus, and...

Students are taken on an exciting animated trip to the outer reaches of our solar system. Images from NASA and the Hubble space Telescope illustrate the Giant Red Spot on Jupiter, Saturns' beautiful rings, the tilted rings of Uranus, and...

This video provides an overview of Mars, the fourth planet from the Sun. It highlights key facts such as its diameter, mass, moons, and orbit period. The video also explains the origin of Mars' name, its association with the God of War,...