Astronomers have, for the first time, spotted a planet that is considered to be in the "Goldilocks zone," meaning that its environment is just right to sustain life: not too hot, not too cold. Scientists approximate that...

The Two Micron All Sky Survey at IPAC website provides an image gallery of the solar system's objects, Jupiter's moons, H II regions, star formation regions, and reflection nebulae, open star clusters, globular star...

This NASA Image of the Day is the first image of the Earth and moon in a single photograph. The image was captured 7.25 million miles from Earth by Voyager 1 in 1977. More information about the photograph and a link to...

This case study uses the example of Pluto: how do we determine what a planet is? The lesson compares orbital parameters like semi-major axis, orbital period and orbital resonance of different planets. The material would...

This Public Broadcasting Service (PBS) activity explores the controversy over whether or not there is life on Mars. Part of the Mysteries of Deep Space Program that originally aired in April 1997, the activity includes...