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NASA Data Reveals Possible Reason Some Exoplanets Are Shrinking


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NASA Data Reveals Possible Reason Some Exoplanets Are Shrinking

This artist’s concept shows what the sub-Neptune exoplanet TOI-421 b
This artist’s concept shows what the sub-Neptune exoplanet TOI-421 b might look like. In a new study, scientists have found new evidence suggesting how these types of planets can lose their atmospheres.
NASA, ESA, CSA, and D. Player (STScI)

A new study could explain the ‘missing’ exoplanets between super-Earths and sub-Neptunes.

Some exoplanets seem to be losing their atmospheres and shrinking. In a new study using NASA’s retired Kepler Space Telescope, astronomers find evidence of a possible cause: The cores of these planets are pushing away their atmospheres from the inside out.

Exoplanets (planets outside our solar system) come in a variety of sizes, from small, rocky planets to colossal gas giants. In the middle lie rocky super-Earths and larger sub-Neptunes with puffy atmospheres. But there’s a conspicuous absence – a “size gap” – of planets that fall between 1.5 to 2 times the size of Earth (or in between super-Earths and sub-Neptunes) that scientists have been working to better understand.

This video explains the differences between the main types of exoplanets, or planets outside our solar system. Credit: NASA/JPL-Caltech

“Scientists have now confirmed the detection of over 5,000 exoplanets, but there are fewer planets than expected with a diameter between 1.5 and 2 times that of Earth,” said Caltech/IPAC research scientist Jessie Christiansen, science lead for the NASA Exoplanet Archive and lead author of the new study in The Astronomical Journal. “Exoplanet scientists have enough data now to say that this gap is not a fluke. There’s something going on that impedes planets from reaching and/or staying at this size.”

Researchers think that this gap could be explained by certain sub-Neptunes losing their atmospheres over time. This loss would happen if the planet doesn’t have enough mass, and therefore gravitational force, to hold onto its atmosphere. So sub-Neptunes that aren’t massive enough would shrink to about the size of super-Earths, leaving the gap between the two sizes of planets.

But exactly how these planets are losing their atmospheres has remained a mystery. Scientists have settled on two likely mechanisms: One is called core-powered mass loss; and the other, photoevaporation. The study has uncovered new evidence supporting the first.

This infographic details the main types of exoplanets
This infographic details the main types of exoplanets. Scientists have been working to better understand the “size gap,” or conspicuous absence, of planets that fall between super-Earths and sub-Neptunes.
NASA/JPL-Caltech

Solving the Mystery

Core-powered mass loss occurs when radiation emitted from a planet’s hot core pushes the atmosphere away from the planet over time, “and that radiation is pushing on the atmosphere from underneath,” Christiansen said.

The other leading explanation for the planetary gap, photoevaporation, happens when a planet’s atmosphere is essentially blown away by the hot radiation of its host star. In this scenario, “the high-energy radiation from the star is acting like a hair dryer on an ice cube,” she said.

While photoevaporation is thought to occur during a planet’s first 100 million years, core-powered mass loss is thought to happen much later – closer to 1 billion years into a planet’s life. But with either mechanism, “if you don’t have enough mass, you can’t hold on, and you lose your atmosphere and shrink down,” Christiansen added.

For this study, Chistiansen and her co-authors used data from NASA’s K2, an extended mission of the Kepler Space Telescope, to look at the star clusters Praesepe and Hyades, which are 600 million to 800 million years old. Because planets are generally thought to be the same age as their host star, the sub-Neptunes in this system would be past the age where photoevaporation could have taken place but not old enough to have experienced core-powered mass loss.

So if the team saw that there were a lot of sub-Neptunes in Praesepe and Hyades (as compared to older stars in other clusters), they could conclude that photoevaporation hadn’t taken place. In that case, core-powered mass loss would be the most likely explanation of what happens to less massive sub-Neptunes over time.

In observing Praesepe and Hyades, the researchers found that nearly 100% of stars in these clusters still have a sub-Neptune planet or planet candidate in their orbit. Judging from the size of these planets, the researchers think they have retained their atmospheres.

This differs from the other, older stars observed by K2 (stars more than 800 million years old), only 25% of which have orbiting sub-Neptunes. The older age of these stars is closer to the timeframe in which core-powered mass loss is thought to take place.

From these observations, the team concluded that photoevaporation could not have taken place in Praesepe and Hyades. If it had, it would have occurred hundreds of millions of years earlier, and these planets would have little, if any, atmosphere left. This leaves core-powered mass loss as the leading explanation for what likely happens to the atmospheres of these planets.

Christiansen’s team spent more than five years building the planet candidate catalog necessary for the study. But the research is far from complete, she said, and it is possible that the current understanding of photoevaporation and/or core-powered mass loss could evolve. The findings will likely be put to the test by future studies before anyone can declare the mystery of this planetary gap solved once and for all.

This study was conducted using the NASA Exoplanet Archive, which is operated by Caltech in Pasadena under contract with NASA as part of the Exoplanet Exploration Program, which is located at NASA’s Jet Propulsion Laboratory in Southern California. JPL is a division of Caltech.

More About the Mission

On Oct. 30, 2018, Kepler ran out of fuel and ended its mission after nine years, during which it discovered more than 2,600 confirmed planets around other stars along with thousands of additional candidates astronomers are working to confirm.

NASA’s Ames Research Center in Silicon Valley, California, manages the Kepler and K2 missions for NASA’s Science Mission Directorate. JPL managed Kepler mission development. Ball Aerospace & Technologies Corporation operated the flight system with support from the Laboratory for Atmospheric and Space Physics at the University of Colorado in Boulder.

For more information about the Kepler and K2 missions, visit:

https://science.nasa.gov/mission/kepler

News Media Contacts

Calla Cofield
Jet Propulsion Laboratory, Pasadena, Calif.
626-808-2469
calla.e.cofield@jpl.nasa.gov

Karen Fox / Alise Fisher 
NASA Headquarters, Washington
202-358-1257 / 202-358-2546
karen.c.fox@nasa.gov / alise.m.fisher@nasa.gov

Written by Chelsea Gohd

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      Created as a standard method for collecting rocket propulsion test data, NDAS is proving to be a building block to acquire, display, and process various datasets. The flexibility of the software has supplied solutions for NASA’s work in New Mexico and Alabama and is being evaluated for data acquisition needs in Virginia.
      When NASA’s White Sands Test Facility in Las Cruces, New Mexico, needed a new data acquisition system with a flexible design, the facility reached out to NASA Stennis since the center had demonstrated success with a similar challenge.
      “A major benefit for the agency is having a software platform that is agency owned and developed,” said Josh Simmons, White Sands technical upgrades lead. “Stennis is leading the way and the way the system is written and documented, other programmers can jump in, and the way they have it designed, it can continue on and that is key.”
      The NASA Stennis team updated its NDAS platform based on input from White Sands personnel to make it more adaptable and to increase data acquisition rates.
      “They look to understand the requirements and to develop an application that is flexible to meet everybody’s requirements,” Simmons said. “They are always willing to improve it, to make it more applicable to a wider audience.”
      NDAS will be the primary data acquisition and control systems to support testing and development projects related to NASA’s Orion spacecraft.
      “I would like to standardize around it here at White Sands,” said Simmons. “I want to show the worth and versatility of NDAS, so people who need it make a choice to use it.”
      Meanwhile at NASA’s Marshall Space Flight Center in Huntsville, Alabama, NDAS is used in multiple areas for small-scale, subscale, and full-scale testing.
      Devin Rios Ogle is a contractor software engineer at NASA Marshall, responsible for integrating and upgrading the data acquisition system in the testing areas. The system is used to record data on test sequences to verify they happen as intended.
      “The visualization of data is really nice compared to other software I have worked with,” said Rios Ogle. “It is easier to see what data you want to see when you want to see it. You select a measurement, and you can see it in graph form, or tabular form, or however you would like. It is visually appealing and very easy to find the stuff you need.”
      Rios Ogle is familiar with the database behind the system and understands what the program is trying to do. He particularly noted the modular approach built into the system, which allows users to adapt the software as needed and is a feature others would find beneficial.
      Marcus Jackson, a contractor instrumentation and control engineer at NASA Marshall, echoed Ogle’s assessment of NDAS, noting that it has allowed the center to condense multiple systems into a single package that meets the team’s unique needs.
      “Ultimately, NDAS provides us with an excellent software package that is built specifically for the kind of work performed here and at other test stands across the United States,” said Jackson. “It is easy to install, manage, and scale up. It doesn’t break, but if you do find a bug or issue, the NDAS team is very quick to respond and help you find a solution.”
      NDAS also represents a potential solution for engineers seeking to standardize data systems at NASA’s Langley Research Center in Hampton, Virginia, a use that could positively impact a mission’s ability to make data-informed decisions.
      “We are investigating alternatives for standardization at all Langley facilities,” said Scott Simmons, NASA Langley data systems engineer. “Standardization has the potential for significant maintenance cost savings and efficiencies because of the sharing of the software. Having an instance of NDAS available for the dynamic data system at the 8-Foot High Temperature tunnel enables us to evaluate it as a potential solution for standardization at Langley.”
      As the nation’s largest hypersonic blow-down test facility, the tunnel duplicates, as near as possible, flight conditions that would be encountered by hypersonic vehicles at up to Mach 6.5, or more than six times the speed of sound.
      Even as its use grows, the NASA Stennis-led software project continues to gain momentum as it expands its capabilities and collaboration with users.
      “The goal is to provide a software portfolio that supports a wide range of exciting NASA projects, involving lots of talented people that collaborate and innovate new software solutions far into the future,” Mobbs said. “This is a community of innovative, ambitious, and supportive engineers and scientists across all engineering disciplines that are dedicated to advancing NASA’s bold missions.”
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      Last Updated May 08, 2025 Related Terms
      Stennis Space Center View the full article
    • By USH
      In a groundbreaking development, advances in quantum data analysis have led to a discovery no scientist could have foreseen. NASA’s deep space monitoring system, upgraded with a quantum processor designed to filter cosmic noise and decode interstellar signals, produced something startling: an image.
      A conceptual interpretation of the Voyager 1 image.
      But this wasn’t an input, a simulation, or a product of algorithmic imagination. It wasn’t the result of random noise or a misfired pattern recognition process. The quantum system returned a coherent, structured, and symmetrical image, undeniably artificial. And the data it derived from? None other than Voyager 1. 
      Renowned physicist Michio Kaku addressed the anomaly in a recent interview: “We may be witnessing the first whisper of a new intelligence, something not man-made, not terrestrial, and certainly not random.” 
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      Not long ago, NASA pushed the boundaries of computation by launching an experimental quantum computer, capable of processing vast, multidimensional data streams. But after this revelation, NASA abruptly shut down the system following the unexpected and unsettling incident, in 2023, though some believe the research continued in secret. 
      Meanwhile, Voyager 1—the most distant human-made object in space, still traveling beyond our solar system after 45 years—has been transmitting strange, inexplicable data. According to NASA engineers, the spacecraft’s Attitude Articulation and Control System (AACS) began sending signals that “do not reflect what’s actually happening onboard.” 
      Instead of useful telemetry, Voyager 1 has been broadcasting a puzzling sequence: a repeating pattern of ones and zeros. Initially dismissed as a glitch, engineers traced the anomaly to the Flight Data Subsystem (FDS), pinpointing a malfunctioning chip. Yet, despite their efforts, the signal persisted, a digital enigma from 24 billion kilometers away. 
      Is this merely a failing system showing its age? Or is something, or someone, intentionally altering the data? 
      What if this “error” is a message? And if so, who’s sending it?
        View the full article
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