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The Red Planet
Mars is a cold desert world. It is half the diameter of Earth and has the same amount of dry land. Like Earth, Mars has seasons, polar ice caps, volcanoes, canyons and weather, but its atmosphere is too thin for liquid water to exist for long on the surface. There are signs of ancient floods on Mars, but evidence for water now exists mainly in icy soil and thin clouds.

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The Opposition of Mars
The Opposition of Mars
By the time you finish reading this story, you'll be about 1,000 km closer to the planet Mars.Read More...
MAVEN Solar Wind Electron Analyzer Seeks Answers at Microscopic Levels
MAVEN Solar Wind Electron Analyzer Seeks Answers at Microscopic Levels
When the Mars Atmosphere and Volatile Evolution Mission launches in November to study why the Red Planet is losing its atmosphere, one of its instruments will look to electrically charged particles called electrons for answers.Read More...
Planetary Seasons
Planetary Seasons
Planetary seasons are caused by two factors: axial tilt and variable distance from the sun (orbital eccentricity).Read More...
Mars Rover Provides Clues to Mars' Past Atmosphere
Mars Rover Provides Clues to Mars' Past Atmosphere
New results from the Sample Analysis at Mars (SAM) investigation on NASA's Curiosity rover reveal new clues about the atmospheric composition on Mars, and about how the planet lost much of its original atmosphere.Read More...
New Evidence for a Martian Ocean
New Evidence for a Martian Ocean
Scientists studying data from NASA's Mars Reconnaissance Orbiter (MRO) have discovered new evidence that Mars may have once had a vast ocean on its surface.Read More...
Comet ISON to fly by Mars
Comet ISON to fly by Mars
Around the world, astronomers are buzzing with anticipation over the approach of Comet ISON.Read More...
Ancient Snowfall on Mars
Ancient Snowfall on Mars
A new study supported in part by NASA has identified a potential origin for ancient water on Mars that was responsible for carving valley networks that branch across the planet's surfaceRead More...
JPL, Masten Testing New Precision Landing Software
JPL, Masten Testing New Precision Landing Software
JPL engineers collaborate with NASA Dryden on tests of spacecraft landing technology using Masten Space Systems' Xombie rocket.Read More...
MAVEN Eyes Mars as Launch Preps Begin
MAVEN Eyes Mars as Launch Preps Begin
MAVEN's approach to Mars studies will be quite different from that taken by recent probes dispatched to the Red Planet.Read More...
Evidence for a Martian Ocean
Evidence for a Martian Ocean
Researchers at the California Institute of Technology (Caltech) have discovered evidence for an ancient delta on Mars where a river might once have emptied into a vast ocean.Read More...
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Previous
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The Opposition of Mars
The Opposition of Mars
By the time you finish reading this story, you'll be about 1,000 km closer to the planet Mars.Read More...
MAVEN Solar Wind Electron Analyzer Seeks Answers at Microscopic Levels
MAVEN Solar Wind Electron Analyzer Seeks Answers at Microscopic Levels
When the Mars Atmosphere and Volatile Evolution Mission launches in November to study why the Red Planet is losing its atmosphere, one of its instruments will look to electrically charged particles called electrons for answers.Read More...
Planetary Seasons
Planetary Seasons
Planetary seasons are caused by two factors: axial tilt and variable distance from the sun (orbital eccentricity).Read More...
Mars Rover Provides Clues to Mars' Past Atmosphere
Mars Rover Provides Clues to Mars' Past Atmosphere
New results from the Sample Analysis at Mars (SAM) investigation on NASA's Curiosity rover reveal new clues about the atmospheric composition on Mars, and about how the planet lost much of its original atmosphere.Read More...
New Evidence for a Martian Ocean
New Evidence for a Martian Ocean
Scientists studying data from NASA's Mars Reconnaissance Orbiter (MRO) have discovered new evidence that Mars may have once had a vast ocean on its surface.Read More...
Comet ISON to fly by Mars
Comet ISON to fly by Mars
Around the world, astronomers are buzzing with anticipation over the approach of Comet ISON.Read More...
Ancient Snowfall on Mars
Ancient Snowfall on Mars
A new study supported in part by NASA has identified a potential origin for ancient water on Mars that was responsible for carving valley networks that branch across the planet's surfaceRead More...
JPL, Masten Testing New Precision Landing Software
JPL, Masten Testing New Precision Landing Software
JPL engineers collaborate with NASA Dryden on tests of spacecraft landing technology using Masten Space Systems' Xombie rocket.Read More...
MAVEN Eyes Mars as Launch Preps Begin
MAVEN Eyes Mars as Launch Preps Begin
MAVEN's approach to Mars studies will be quite different from that taken by recent probes dispatched to the Red Planet.Read More...
Evidence for a Martian Ocean
Evidence for a Martian Ocean
Researchers at the California Institute of Technology (Caltech) have discovered evidence for an ancient delta on Mars where a river might once have emptied into a vast ocean.Read More...
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