Space Stories: More Water on Mars, Senators Want Mars Sample Returned to Earth, and the ESA Considers Mission to Enceladus

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Here are some recent stories of interest.

—Euronews: “Photos from NASA’s Curiosity Rover Suggest Mars had More Water for Longer Than Previously Thought“

Scientists say Mars may have had more water and stayed wet for longer than they had previously estimated based on photos from NASA’s Curiosity rover. An international team of researchers led by Imperial College London recently found unusual formations in rock and sediment in unexpected places in the crater. The rocks allow scientists to compare the evolving geology of Mars with Earth.

—U.S. Senate: “Padilla, Butler Urge NASA to Fully Fund Mars Sample Return Program“

Today, U.S. Senators Alex Padilla and Laphonza Butler (both D-Calif.) wrote to NASA Administrator Bill Nelson urging him to allocate the full $650 million necessary to fund the Mars Sample Return (MSR) mission in NASA’s FY24 spending plan. The Senators are issuing the letter following the passage of the FY 2024 appropriations package, which reiterated Congress’ strong commitment to the MSR mission.

—European Space Agency: “Saturn’s Moon Enceladus Top Target for ESA“

A fresh, icy crust hides a deep, enigmatic ocean. Plumes of water burst through cracks in the ice, shooting into space. An intrepid lander collects samples and analyses them for hints of life. ESA has started to turn this scene into a reality, devising a mission to investigate an ocean world around either Jupiter or Saturn. But which moon should we choose? What should the mission do exactly? A team of expert scientists has delivered their findings...Aiming for transformational science, considering the characteristics of each moon and future planned missions to Jupiter and Saturn’s ocean worlds, the scientists identified Saturn’s moon Enceladus as the most compelling target, followed by Saturn’s moon Titan and then Jupiter’s moon Europa.

Study Findings: A Recently Formed Ocean Inside Saturn’s Moon Mimas

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Image (Credit): Saturn’s moon Mimas and its large Herschel Crater. The moon is also referred to as the “Death Star” from Star Wars. (NASA/JPL-Caltech/Space Science Institute)

Nature  abstract of the study findings:

Moons potentially harbouring a global ocean are tending to become relatively common objects in the Solar System. The presence of these long-lived global oceans is generally betrayed by surface modification owing to internal dynamics. Hence, Mimas would be the most unlikely place to look for the presence of a global ocean. Here, from detailed analysis of Mimas’s orbital motion based on Cassini data, with a particular focus on Mimas’s periapsis drift, we show that its heavily cratered icy shell hides a global ocean, at a depth of 20–30 kilometres. Eccentricity damping implies that the ocean is likely to be less than 25 million years old and still evolving. Our simulations show that the ocean–ice interface reached a depth of less than 30 kilometres only recently (less than 2–3 million years ago), a time span too short for signs of activity at Mimas’s surface to have appeared.

Citation: Lainey, V., Rambaux, N., Tobie, G. et al. A recently formed ocean inside Saturn’s moon Mimas. Nature 626, 280–282 (2024).

https://doi.org/10.1038/s41586-023-06975-9

Study-related stories:

Space Quote: Has the JWST Changed Astronomy Forever?

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Image (Credit): On June 25, 2023, NASA’s James Webb Space Telescope conducted its first near-infrared observations of Saturn using its Near-Infrared Camera. (NASA, ESA, CSA, Matthew Tiscareno (SETI Institute), Matthew Hedman (University of Idaho), Maryame El Moutamid (Cornell University), Mark Showalter (SETI Institute), Leigh Fletcher (University of Leicester), Heidi Hammel (AURA))

“Physicists and astronomers are starting to get the sense that something may be really wrong. It’s not just that some of us believe we might have to rethink the standard model of cosmology; we might also have to change the way we think about some of the most basic features of our universe — a conceptual revolution that would have implications far beyond the world of science.”

-Statement by guess essayists Adam Frank and Marcelo Gleiser in a New York Times article about the James Webb Space Telescope titled “The Story of Our Universe May Be Starting to Unravel.” Dr. Frank is an astrophysicist at the University of Rochester. Dr. Gleiser is a theoretical physicist at Dartmouth College.

What Will the JWST Peer At Next?

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If you are wondering where the James Webb Space Telescope (JWST) will be looking in the future, some of that is known and some has yet to be determined. The approved targets of the space telescope can be found at the Programmatic Categories of JWST Science Observations site.

The site breaks the approved targets into these six categories:

  • General Observer (GO) Programs: Observations and archival research proposed by the community and selected by peer review.
  • Guaranteed Time Observations (GTO) Programs: Observations defined by members of the instrument and telescope science teams, as well as a number of interdisciplinary scientists.
  • Director’s Discretionary Time (DDT): Time-critical observations that cannot be scheduled for a regular proposal cycle.
  • Director’s Discretionary Early Release Science (DD-ERS) Programs: Observations to be executed within the first five months of science operations and immediately released to the community.
  • Calibration Programs: Observations used to calibrate the science instruments in support of all the other science programs.
  • First Image Observations: The first observations following commissioning to demonstrate the observatory’s capabilities.

The GO Programs have been decided through Cycle 2. Earlier this month, the Space Telescope Science Institute put out a call for Cycle 3 Call for Proposals for the GO Programs. Proposals are due by October 25, 2023 and selected proposals will be announced in February 2024.

Take a look at the existing list and you will find plenty of interesting areas of study. For instance, under the Cycle 3 GTO Programs you have areas such as:

  • Titan Surface and Atmosphere;
  • Exoplanet search around Altair; and
  • Search for Varuna’s Satellite.

Voyager 2 is Still Talking to Us

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Image (Credit): Artist’s rendering of Voyager 2. (NASA)

After two weeks with no word, Voyager 2 is back to communicating with us as it continues its journey beyond our solar system. The whole incident started when NASA sent a bad command, but all is well.

Voyager 2 first left Earth back in August 1977 and exited the solar system in December 2018. Like Voyager 1, which is also outside the solar system now, Voyager 2 had the initial task of studying the planets. Voyager 2 focused on Jupiter, Saturn, Uranus and Neptune. It has shown it was capable of much more as it dragged the human race to the bleeding edge of space.

You can read all about Voyager 2’s accomplishments at this NASA site, including:

  • Voyager 2 is the only spacecraft to study all four of the solar system’s giant planets at close range.
  • Voyager 2 discovered a 14th moon at Jupiter.
  • Voyager 2 was the first human-made object to fly past Uranus.
  • At Uranus, Voyager 2 discovered 10 new moons and two new rings.
  • Voyager 2 was the first human-made object to fly by Neptune.
  • At Neptune, Voyager 2 discovered five moons, four rings, and a “Great Dark Spot.”

An impressive list of accomplishments, and the spacecraft is still ticking as it goes into the great unknown.

We need to keep these achievements in mind as we battle over this year’s NASA budget. We also need to remember that there was supposed to be four Voyager-like spacecraft rather than two, but budget cuts nixed the second set. Meaning we can still get some great things done even if we don’t have the budget to fund every piece of a grand vision.