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A comparison of two radargrams from the SHARAD instrument on NASA's Mars Reconnaissance Orbiter shows effects on the Martian ionosphere from the close passage of a comet.
Radar Sees Effect of Comet Flyby on Mars' Ionosphere
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These plots portray data from radar sounding of Mars' mid-latitude ionosphere at three times on Oct. 19 and 20, 2014. The middle one shows effects of dust from a comet that passed near Mars that day. The data are from the MARSIS instrument on the European Space Agency's Mars Express orbiter.
Mars' Mid-Latitude Ionospheric Effects of Comet Flyby
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These spectrograms from the MARSIS instrument on the European Space Agency's Mars Express orbiter show the intensity of radar echo in Mars' far-northern ionosphere at three times on Oct. 19 and 20, 2014. The middle plot reveals effects attributed to dust from a comet that passed near Mars that day.
Radar-Detected Change in Mars' Near-Polar Ionosphere
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These eight graphs present data from the Neutral Gas and Ion Mass Spectrometer on NASA's MAVEN orbiter identifying ions of different metals added to the Martian atmosphere shortly after comet C/2013 A1 Siding Spring sped close to Mars. Dust particles from the comet delivered the metals to Mars.
Metals from Comet Dust Detected in Mars Atmosphere
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The places where the red line on this graph extends higher than the blue line show detection of metals added to the Martian atmosphere from dust particles released by a passing comet on Oct. 19, 2014. The graphed data are from the Imaging Ultraviolet Spectrograph (IUVS) on NASA's MAVEN spacecraft.
Comet Put Magnesium and Iron into Martian Atmosphere
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This illustration depicts the Imaging Ultraviolet Spectrograph (IUVS) on NASA's MAVEN spacecraft scanning the upper atmosphere of Mars.
Illustration of MAVEN's Ultraviolet Imager at Work
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Mariner Space Craft in test facility
Mariner Space Craft Weight Test
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Mariner 4 launch
Launch of Mariner 4 Spacecraft in 1964
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Walt Disney and Dr. Wernher von Braun and a model rocket
Walt Disney and Dr. Wernher von Braun
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This animation and still image of comet C/2013 A1 Siding Spring were taken by the Mast Camera (Mastcam) on NASA's Curiosity Mars rover as the comet passed near the red planet on Oct. 19, 2014.
Mars Curiosity Rover Views Comet Siding Spring
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This view shows the path and some key places in a survey of the "Pahrump Hills" outcrop by NASA's Curiosity Mars rover in autumn of 2014. The outcrop is at the base of Mount Sharp within Gale Crater.
Mars Rover Curiosity's Walkabout at 'Pahrump Hills'
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This side-by-side comparison shows the X-ray diffraction patterns of two different samples collected from rocks on Mars by NASA's Curiosity rover. The images present data obtained by Curiosity's Chemistry and Mineralogy instrument (CheMin).
Signature of Hematite in 'Confidence Hills' Martian Rock
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This side-by-side comparison shows the X-ray diffraction patterns of two different samples collected from rocks on Mars by NASA's Curiosity rover. The images present data obtained by Curiosity's Chemistry and Mineralogy instrument (CheMin).
Signature of Hematite in 'Confidence Hills' Martian Rock (Labeled)
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This image from NASA's Curiosity rover shows a sample of powdered rock extracted by the rover's drill from the "Confidence Hills" target -- the first rock drilled after Curiosity reached the base of Mount Sharp in September 2014.
'Confidence Hills' Drill Powder in Scoop
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This image shows the first holes drilled by NASA's Mars rover Curiosity at Mount Sharp. The loose material near the drill holes is drill tailings and an accumulation of dust that slid down the rock during drilling.
'Confidence Hills' - The First Mount Sharp Drilling Site (Labeled)
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This image shows the first holes drilled by NASA's Mars rover Curiosity at Mount Sharp. The loose material near the drill holes is drill tailings and an accumulation of dust that slid down the rock during drilling.
'Confidence Hills' - The First Mount Sharp Drilling Site
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NASA's Orion spacecraft was completed Thursday, Oct. 30, 2014 in the Launch Abort System Facility at NASA's Kennedy Space Center in Florida. It will reside there until Nov. 10, when it will be rolled out to Launch Complex 37 at Cape Canaveral Air Force Station ahead of its Dec. 4 test flight.
NASA's Orion Spacecraft Complete
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An artist's impression of the first Orion spacecraft in orbit attached to a Delta IV Upper Stage during Exploration Flight Test-1.
Artist's Concept of Orion's First Flight Test
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These two infrared images of comet C/2013 A1 Siding Spring were taken by the Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) aboard NASA's Mars Reconnaissance Orbiter on Oct. 19, 2014. This Oort Cloud comet was making its first voyage through the inner solar system.
Mars-Orbiting Spectrometer's Images Show Comet's Coma
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This image shows a star field with Mars as a small orange ball on the right and above it a bright comet in white with a tail.
View of Comet Siding Spring and Mars from Hubble
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NASA's MAVEN spacecraft obtained this ultraviolet image of hydrogen surrounding comet Siding Spring on Oct. 17, 2014, two days before the comet's closest approach to Mars.
MAVEN Image of Comet Siding Spring's Hydrogen Coma
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These images were taken of comet C/2013 A1 Siding Spring by NASA's Mars Reconnaissance Orbiter on Oct. 19, 2014, during the comet's close flyby of Mars and the spacecraft.
First Resolved Image of a Long-Period Comet's Nucleus
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This two-image blink shows a comparison of two exposure times in images from the panoramic camera (Pancam) on NASA's Mars Exploration Rover Opportunity showing comet C/2013 A1 Siding Spring as it flew near Mars on Oct. 19, 2014.
Mars Rover View of Comet (Blink of Two Exposures)
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Researchers used the panoramic camera (Pancam) on NASA's Mars Exploration Rover Opportunity to capture this 10-second-exposure view of comet C/2013 A1 Siding Spring as it passed near Mars on Oct. 19, 2014.
Opportunity's View of Passing Comet (Short Exposure)
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Researchers used the panoramic camera (Pancam) on NASA's Mars Exploration Rover Opportunity to capture this 10-second-exposure view of comet C/2013 A1 Siding Spring as it passed near Mars on Oct. 19, 2014.
Opportunity's View of Passing Comet (Short Exposure - Labeled)
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