Shop Windows to the Universe

With Explore the Planets, investigate the planets, their moons, and understand the processes that shape them. By G. Jeffrey Taylor, Ph.D. See our DVD collection.

Exploratour: Life on Mars?

This is a Viking image of the surface of Mars. The footpad of the Viking lander is visible in the corner of the image.
Click on image for full size
NASA

Introduction

When we ask "Where might we find life outside of the Earth", the first place many scientists turn to is Mars. Mars may have been like the Earth in its past. No signs of life on Mars have been found, but scientists will continue to search.

Use the navigation button at the top of the page to move through the tour. To go to the next page, just press the forward link on the navigation button.

Shop Windows to the Universe Science Store!

Our online store includes issues of NESTA's quarterly journal, The Earth Scientist, full of classroom activities on different topics in Earth and space science, as well as books on science education!

You might also be interested in:

Cool It! Game

Check out our online store - minerals, fossils, books, activities, jewelry, and household items!...more

Mars Rover Landing Sites Selected

NASA will soon send two robot rovers to Mars. Rockets carrying the two rovers will be launched from Earth in May and June of 2003. The rovers will get to Mars in January 2004. NASA just decided where on...more

The Search for Life on…Earth!

Scientists are studying what lives in lakes high in the Andes Mountains to learn how life may survive in other places in the solar system. One of the lakes is on top of a volcano in Chile. Being so far...more

Overview of the Mars Express Mission

The European Space Agency (ESA) launched a mission to Mars in June of 2003. The mission is called "Mars Express". The Mars Express spacecraft has two parts. One part will orbit Mars for at least one Martian...more

Mars Express Landing Site - Isidis Planitia

The European Space Agency (ESA) launched a mission to Mars in June of 2003. The mission is called "Mars Express". The Mars Express spacecraft has two parts. One part will orbit Mars for at least one Martian...more

Isidis Planitia

Isidis Planitia is the name of a place on Mars. Isidis Planitia is a very flat plain. It is inside the bottom of a very old crater. Isidis Planitia is big. It is about 1,500 km (930 miles) across. That...more

MER Spirit landing site - Gusev Crater

Two robot rovers landed on Mars in January 2004. The first robot is named Spirit. Spirit landed inside a big crater called Gusev Crater. Gusev Crater may have been filled with water long ago. It may have...more

A place on Mars called Gusev Crater

Gusev Crater is an impact crater on Mars that looks as though a lake may have once filled it in the distant past. One of the two Mars Exploration Rovers (MER) will explore Gusev Crater beginning in January...more

Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part by the National Science Foundation and NASA, our Founding Partners (the American Geophysical Union and American Geosciences Institute) as well as through Institutional, Contributing, and Affiliate Partners, individual memberships and generous donors. Thank you for your support! NASA AGU AGI NSF