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Hubble Catches Jupiter's Largest Moon Going to the 'Dark Side'
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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 4500-4501: Bedrock With a Side of Sand
NASA’s Mars rover Curiosity acquired this image using its Left Navigation Camera on March 28, 2025 — Sol 4494, or Martian day 4,494 of the Mars Science Laboratory mission — at 17:06:34 UTC. NASA/JPL-Caltech Written by Sharon Wilson Purdy, Planetary Geologist at Smithsonian National Air and Space Museum
Earth planning date: Wednesday, April 2, 2025
Wow, sol 4500. What an impressive number of sols (Martian days) exploring the Red Planet! This delightfully even sol number made me wonder where the Mars Exploration Rover (MER) Opportunity was at this point in her mission (Opportunity’s twin rover, Spirit, explored Gusev crater on Mars for roughly 2210 sols). As it turns out, Opportunity was driving over fairly smooth terrain on sol 4500 and was approaching a light-toned rounded hill named “Spirit Mound” on the western rim of Endeavour crater in Meridiani Planum.
I am always so impressed and proud when I stop to think about the incredible fleet of rovers we have safely landed and operated on Mars, and the amazing scientific discoveries that have resulted from these missions!
Today I served on science operations as the “keeper of the plan” for the geology and mineralogy theme group. In this role, I assembled the activities in our team planning software for this two-sol plan. Our small plan becomes part of a much larger set of instructions that will be relayed up to the rover later today. Currently, the Curiosity rover is driving up Mount Sharp over broken-up blocks of bedrock and sand through a small canyon en route to the boxwork structures ahead. This bumpy terrain can sometimes make it hard to pass the “Slip Risk Assessment Process” (SRAP) where all six wheels are required to be stable on the ground before we can unstow our robotic arm to use the contact science instruments. After our successful 8-meter drive (about 26 feet) from yestersol we passed SRAP and got to work selecting targets for contact and remote observations.
The team chose to characterize a bedrock target in front of us called “Chuckwalla” using the dust removal tool (DRT), APXS, and MAHLI. ChemCam used its LIBS instrument to analyze the chemistry of a nearby bedrock target with a knobby texture, “Pechacho,” and took a long distance RMI image to study the interesting layering in the “Devil’s Gate” butte. Mastcam assembled an impressive portfolio of observations in this two-sol plan. The team imaged variations in bedrock textures at “Jalama” and “Julian” and documented the nature of the “Mishe Mokwa” ridgeline. In addition, Mastcam imaged darker rocks within a previously acquired mosaic of Devil’s Gate and investigated narrow troughs (small depressions) within the sand in the workspace.
The environmental theme group, with their eye on the sky, included activities to measure the optical depth of the atmosphere, constrain aerosol scattering properties, and observe clouds. A very busy day of planning for sols 4500-4501, with many more to come!
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Last Updated Apr 07, 2025 Related Terms
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Explore Hubble Hubble Home Overview About Hubble The History of Hubble Hubble Timeline Why Have a Telescope in Space? Hubble by the Numbers At the Museum FAQs Impact & Benefits Hubble’s Impact & Benefits Science Impacts Cultural Impact Technology Benefits Impact on Human Spaceflight Astro Community Impacts Science Hubble Science Science Themes Science Highlights Science Behind Discoveries Hubble’s Partners in Science Universe Uncovered Explore the Night Sky Observatory Hubble Observatory Hubble Design Mission Operations Missions to Hubble Hubble vs Webb Team Hubble Team Career Aspirations Hubble Astronauts News Hubble News Social Media Media Resources Multimedia Multimedia Images Videos Sonifications Podcasts e-Books Online Activities Lithographs Fact Sheets Posters Hubble on the NASA App Glossary More 35th Anniversary Online Activities 2 min read
Hubble Studies a Nearby Galaxy’s Star Formation
This NASA/ESA Hubble Space Telescope image features the picturesque spiral galaxy NGC 4941. ESA/Hubble & NASA, D. Thilker This NASA/ESA Hubble Space Telescope image features the picturesque spiral galaxy NGC 4941, which lies about 67 million light-years from Earth in the constellation Virgo (The Maiden). Because this galaxy is nearby, cosmically speaking, Hubble’s keen instruments are able to pick out exquisite details such as individual star clusters and filamentary clouds of gas and dust.
The data used to construct this image were collected as part of an observing program that investigates the star formation and stellar feedback cycle in nearby galaxies. As stars form in dense, cold clumps of gas, they begin to influence their surroundings. Stars heat and stir up the gas clouds in which they form through winds, starlight, and — eventually, for massive stars — by exploding as supernovae. These processes are collectively called stellar feedback, and they influence the rate at which a galaxy can form new stars.
As it turns out, stars aren’t the only entities providing feedback in NGC 4941. At the heart of this galaxy lies an active galactic nucleus: a supermassive black hole feasting on gas. As the black hole amasses gas from its surroundings, the gas swirls into a superheated disk that glows brightly at wavelengths across the electromagnetic spectrum. Similar to stars — but on a much, much larger scale — active galactic nuclei shape their surroundings through winds, radiation, and powerful jets, altering not only star formation but also the evolution of the galaxy as a whole.
Facebook logo @NASAHubble @NASAHubble Instagram logo @NASAHubble Media Contact:
Claire Andreoli (claire.andreoli@nasa.gov)
NASA’s Goddard Space Flight Center, Greenbelt, MD
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Last Updated Apr 04, 2025 Editor Andrea Gianopoulos Location NASA Goddard Space Flight Center Related Terms
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