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By NASA
Explore This Section Perseverance Home Mission Overview Rover Components Mars Rock Samples Where is Perseverance? Ingenuity Mars Helicopter Mission Updates Science Overview Objectives Instruments Highlights Exploration Goals News and Features Multimedia Perseverance Raw Images Images Videos Audio More Resources Mars Missions Mars Sample Return Mars Perseverance Rover Mars Curiosity Rover MAVEN Mars Reconnaissance Orbiter Mars Odyssey More Mars Missions Mars Home 3 min read
Visiting Mars on the Way to the Outer Solar System
Written by Roger Wiens, Principal Investigator, SuperCam instrument / Co-Investigator, SHERLOC instrument at Purdue University
A portion of the “Sally’s Cove” outcrop where the Perseverance rover has been exploring. The radiating lines in the rock on the left of the image may indicate that it is a shatter cone, showing the effects of the shock wave from a nearby large impact. The image was taken by Mastcam-Z’s left camera on March 21, 2025 (Sol 1452, or Martian day 1,452 of the Mars 2020 mission) at the local mean solar time of 12:13:44. Mastcam-Z is a pair of cameras located high on the rover’s mast. This image was voted by the public as “Image of the week.” NASA/JPL-Caltech/ASU Recently Mars has had a few Earthly visitors. On March 1, NASA’s Europa Clipper flew within 550 miles (884 kilometers) of the Red Planet’s surface on its way out to Jupiter. On March 12, the European Space Agency’s Hera spacecraft flew within about 3,100 miles (5,000 kilometers) of Mars, and only 300 kilometers from its moon, Deimos. Hera is on its way to study the binary asteroid Didymos and its moon Dimorphos. Next year, in May 2026, NASA’s Psyche mission is scheduled to buzz the Red Planet on its way to the metal-rich asteroid 16 Psyche, coming within a few thousand kilometers.
Why all these visits to Mars? You might at first think that they’re using Mars as an object of opportunity for their cameras, and you would be partially right. But Mars has more to give these missions than that. The main reason for these flybys is the extra speed that Mars’ velocity around the Sun can give them. The idea that visiting a planet can speed up a spacecraft is not all that obvious, because the same gravity that attracts the spacecraft on its way towards the planet will exert a backwards force as the spacecraft leaves the planet.
The key is in the direction that it approaches and leaves the planet. If the spacecraft leaves Mars heading in the direction that Mars is traveling around the Sun, it will gain speed in that direction, slingshotting it farther into the outer solar system. A spacecraft can typically gain several percent of its speed by performing such a slingshot flyby. The closer it gets to the planet, the bigger the effect. However, no mission wants to be slowed by the upper atmosphere, so several hundred kilometers is the closest that a mission should go. And the proximity to the planet is also affected by the exact direction the spacecraft needs to go when it leaves Mars.
Clipper’s Mars flyby was a slight exception, slowing down the craft — by about 1.2 miles per second (2 kilometers per second) — to steer it toward Earth for a second gravity assist in December 2026. That will push the spacecraft the rest of the way to Jupiter, for its 2030 arrival.
While observing Mars is not the main reason for their visits, many of the visiting spacecraft take the opportunity to use their cameras either to perform calibrations or to study the Red Planet and its moons.
During Clipper’s flyby over sols 1431-1432, Mastcam-Z was directed to watch the skies for signs of the interplanetary visitor. Clipper’s relatively large solar panels could have reflected enough sunlight for it to be seen in the Mars night sky, much as we can see satellites overhead from Earth. Unfortunately, the spacecraft entered the shadow of Mars just before it came into potential view above the horizon from Perseverance’s vantage point, so the sighting did not happen. But it was worth a try.
Meanwhile, back on the ground, Perseverance is performing something of a cliff-hanger. “Sally’s Cove” is a relatively steep rock outcrop in the outer portion of Jezero crater’s rim just north of “Broom Hill.” Perseverance made an approach during March 19-23, and has been exploring some dark-colored rocks along this outcrop, leaving the spherules behind for the moment. Who knows what Perseverance will find next?
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Last Updated Mar 28, 2025 Related Terms
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By European Space Agency
Video: 00:05:23 For over a decade, ESA’s Gaia mission has mapped our galaxy with stunning precision—rewriting the story of the Milky Way. As its mission enters a new phase, we look back at its most groundbreaking discoveries.
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By European Space Agency
The European Space Agency (ESA) has powered down its Gaia spacecraft after more than a decade spent gathering data that are now being used to unravel the secrets of our home galaxy.
On 27 March 2025, Gaia’s control team at ESA’s European Space Operations Centre carefully switched off the spacecraft’s subsystems and sent it into a ‘retirement orbit’ around the Sun.
Though the spacecraft’s operations are now over, the scientific exploitation of Gaia’s data has just begun.
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By NASA
Curiosity Navigation Curiosity Home Mission Overview Where is Curiosity? Mission Updates Science Overview Instruments Highlights Exploration Goals News and Features Multimedia Curiosity Raw Images Images Videos Audio Mosaics More Resources Mars Missions Mars Sample Return Mars Perseverance Rover Mars Curiosity Rover MAVEN Mars Reconnaissance Orbiter Mars Odyssey More Mars Missions Mars Home 3 min read
Sols 4475-4476: Even the Best-Laid Plans
NASA’s Mars rover Curiosity acquired this image of “Gould Mesa,” named for a hill near NASA’s Jet Propulsion Laboratory in Southern California, using its Right Navigation Camera on March 6, 2025 — sol 4472, or Martian day 4,472 of the Mars Science Laboratory mission — at 01:37:17 UTC. NASA/JPL-Caltech Written by Deborah Padgett, OPGS Task Lead at NASA’s Jet Propulsion Laboratory
Earth planning date: Friday, March 7, 2025
In Curiosity’s last plan, the team decided to drive toward a very interesting nodular rock. The rover team hoped to do a detailed study of its surface texture over the weekend. However, Curiosity did not receive its expected Friday morning downlink of images taken after its drive. The MSL team did receive a tiny bit of data confirming that Curiosity’s drive finished as expected. Unfortunately, without images to determine exactly where Curiosity was located relative to its intended destination, the team was unable to do any instrument pointing at nearby objects, known as “targeted” observations. However, the rover team showed its resilience by filling the weekend plan with a full slate of fascinating remote observations of the terrain and sky around Curiosity’s current perch, high in the canyons of Mount Sharp. Our science and instrument teams always keep a list of backup observations close at hand — frequently those taking too much time to fit in a typical sol plan — in case they get an unexpected opportunity to use them!
On sol 4475, Curiosity will start its first science block midday with two back-to-back dust-devil surveys with Navcam. These searches for Martian whirlwinds will be followed by a measurement of atmospheric dust with Mastcam. Mastcam will then do its first large panorama image of the plan, an 11×3 mosaic starboard of the rover to document bedrock and regolith in an area with a dark band of material seen from orbit. This long observation will be followed by an AEGIS activity, using Navcam to find targets for ChemCam’s laser spectrograph. Curiosity will then repeat its post-drive imaging at high quality, hopefully to be received at JPL before Monday’s planning day. In the evening, APXS will do atmospheric composition studies for several hours.
The next day will be a “soliday,” without any observations. Early in the morning of sol 4476, Mastcam will take its second large panorama, which will be a fantastic 37×4 mosaic of sunrise on the slopes of Gould Mesa (see image). In the afternoon, there will be a Mastcam dust measurement, ChemCam calibration observation, ChemCam passive sky, and two more dust-devil surveys. The next morning, there will be a set of Navcam cloud movies, a dust measurement, and sky phase function observations to support the Mars aphelion cloud-belt campaign. On sol 4477, we will use the post-drive imaging taken over the weekend to plan contact science, then drive away from this location on sol 4478, continuing Curiosity’s journey toward the mysterious boxwork features to the west.
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