The fourth planet from the sun and the outermost of the terrestrial planets, Mars has long been a popular spot for missions and imagination. Learn about the planet's topography, core, and features. We'll take a look back to Mars's past...

This video features the mission of the Phoenix Mars Lander and what it discovered. With behind-the-scenes access, NOVA scienceNOW covers the Mars lander Phoenix's thrilling descent to the martian surface and its critical early days of...

Take a tour of the weather and atmosphere on the rocky planets in our solar system. [5:55]

The fourth planet from the sun and the outermost of the terrestrial planets, Mars has long been a popular spot for missions and imagination. Students will virtually tour the planet's topography, core, and features. Students will take a...

Take a tour of the rocky planets and learn important facts about these planets. Understand that Mercury has no atmosphere which causes its temperatures to vary, Venus is the hottest planet in the solar system, how Earth is unique, and...

What do you know about the Moons of Mars? Nothing? They are super cool (and strange), promise. [1:54]

Animation shows a comparison of the basic features of the Earth with the red planet, Mars. [2:49]

This is the story of Tycho Brahe and Johannes Kepler and the contributions they made to the field of Astronomy. They synthesized a lot of new, old, and bold astronomical ideas into a single sun-centered, eccentricity-positive system....

This is an update on the Curiosity Rover in which the first candidate drill site found on Mars. [1:47]

What would it take for humans to be able to live and work on Mars?

In The Case for Mars, Robert Zubrin argues that humans should colonize the Red Planet.

Listen to an interview with cosmologist Lawrence Krauss as he discusses whether a human expedition to Mars should involve a return trip to the Earth. [10:50]

In this segment, we'll get the big picture on science on the planet Mars. From orbiting observatories to roving rovers to the ditch-digging Phoenix -- what have planetary scientists learned about Mars, and what remains to be discovered?

The latest mission to Mars, Mars Phoenix, is scheduled to touch down on the Red Planet this coming Sunday. We'll talk about the mission and what the scientists behind it hope to achieve.

Consider the possiblity that there may be life on Mars. Watch kids use the scientific method to learn how an orbiting satellite can find water underneath the surface of Mars.

Andy Weir's novel of Mars survival mixes science fact and fiction.

Did the rover shed a piece of plastic while collecting its first scoop of Martian soil?

Planetary scientists and future explorers are trying to learn about our neighboring planet without ever leaving Earth.

Microbes may once have thrived in a freshwater lake on Mars, according to clues in an ancient rock.

Is there life on Mars? Take a look at this video from Bill Nye the Science Guy to see how the Curiosity rover could be used to find out. [:44]