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    • By NASA
      6 min read
      Preparations for Next Moonwalk Simulations Underway (and Underwater)
      It’s been 30 years since the discovery of the first planet around another star like our Sun. With every new discovery, scientists move closer to answering whether there are other planets like Earth that could host life as we know it. NASA/JPL-Caltech The milestone highlights the accelerating rate of discoveries, just over three decades since the first exoplanets were found.
      The official number of exoplanets — planets outside our solar system — tracked by NASA has reached 6,000. Confirmed planets are added to the count on a rolling basis by scientists from around the world, so no single planet is considered the 6,000th entry. The number is monitored by NASA’s Exoplanet Science Institute (NExScI), based at Caltech’s IPAC in Pasadena, California. There are more than 8,000 additional candidate planets awaiting confirmation, with NASA leading the world in searching for life in the universe.
      See NASA's Exoplanet Discoveries Dashboard “This milestone represents decades of cosmic exploration driven by NASA space telescopes — exploration that has completely changed the way humanity views the night sky,” said Shawn Domagal-Goldman, acting director, Astrophysics Division, NASA Headquarters in Washington. “Step by step, from discovery to characterization, NASA missions have built the foundation to answering a fundamental question: Are we alone? Now, with our upcoming Nancy Grace Roman Space Telescope and Habitable Worlds Observatory, America will lead the next giant leap — studying worlds like our own around stars like our Sun. This is American ingenuity, and a promise of discovery that unites us all.”
      Scientists have found thousands of exoplanets (planets outside our solar system) throughout the galaxy. Most can be studied only indirectly, but scientists know they vary widely, as depicted in this artist’s concept, from small, rocky worlds and gas giants to water-rich planets and those as hot as stars. NASA’s Goddard Space Flight Center The milestone comes 30 years after the first exoplanet was discovered around a star similar to our Sun, in 1995. (Prior to that, a few planets had been identified around stars that had burned all their fuel and collapsed.) Although researchers think there are billions of planets in the Milky Way galaxy, finding them remains a challenge. In addition to discovering many individual planets with fascinating characteristics as the total number of known exoplanets climbs, scientists are able to see how the general planet population compares to the planets of our own solar system.
      For example, while our solar system hosts an equal number of rocky and giant planets, rocky planets appear to be more common in the universe. Researchers have also found a range of planets entirely different from those in our solar system. There are Jupiter-size planets that orbit closer to their parent star than Mercury orbits the Sun; planets that orbit two stars, no stars, and dead stars; planets covered in lava; some with the density of Styrofoam; and others with clouds made of gemstones.
      “Each of the different types of planets we discover gives us information about the conditions under which planets can form and, ultimately, how common planets like Earth might be, and where we should be looking for them,” said Dawn Gelino, head of NASA’s Exoplanet Exploration Program (ExEP), located at the agency’s Jet Propulsion Laboratory in Southern California. “If we want to find out if we’re alone in the universe, all of this knowledge is essential.” 
      Searching for other worlds
      Fewer than 100 exoplanets have been directly imaged, because most planets are so faint they get lost in the light from their parent star. The other four methods of planet detection are indirect. With the transit method, for instance, astronomers look for a star to dim for a short period as an orbiting planet passes in front of it.
      To account for the possibility that something other than an exoplanet is responsible for a particular signal, most exoplanet candidates must be confirmed by follow-up observations, often using an additional telescope, and that takes time. That’s why there is a long list of candidates in the NASA Exoplanet Archive (hosted by NExScI) waiting to be confirmed.
      “We really need the whole community working together if we want to maximize our investments in these missions that are churning out exoplanets candidates,” said Aurora Kesseli, the deputy science lead for the NASA Exoplanet Archive at IPAC. “A big part of what we do at NExScI is build tools that help the community go out and turn candidate planets into confirmed planets.”
      The rate of exoplanet discoveries has accelerated in recent years (the database reached 5,000 confirmed exoplanets just three years ago), and this trend seems likely to continue. Kesseli and her colleagues anticipate receiving thousands of additional exoplanet candidates from the ESA (European Space Agency) Gaia mission, which finds planets through a technique called astrometry, and NASA’s upcoming Nancy Grace Roman Space Telescope, which will discover thousands of new exoplanets primarily through a technique called gravitational microlensing.
      Many telescopes contribute to the search for and study of exoplanets, including some in space (artists concepts shown here) and on the ground. Doing the work are organizations around the world, including ESA (European Space Agency), CSA (Canadian Space Agency), and NSF (National Science Foundation). NASA/JPL-Caltech Future exoplanets
      At NASA, the future of exoplanet science will emphasize finding rocky planets similar to Earth and studying their atmospheres for biosignatures — any characteristic, element, molecule, substance, or feature that can be used as evidence of past or present life. NASA’s James Webb Space Telescope has already analyzed the chemistry of over 100 exoplanet atmospheres.
      But studying the atmospheres of planets the size and temperature of Earth will require new technology. Specifically, scientists need better tools to block the glare of the star a planet orbits. And in the case of an Earth-like planet, the glare would be significant: The Sun is about 10 billion times brighter than Earth — which would be more than enough to drown out our home planet’s light if viewed by a distant observer.
      NASA has two main initiatives to try overcoming this hurdle. The Roman telescope will carry a technology demonstration instrument called the Roman Coronagraph that will test new technologies for blocking starlight and making faint planets visible. At its peak performance, the coronagraph should be able to directly image a planet the size and temperature of Jupiter orbiting a star like our Sun, and at a similar distance from that star. With its microlensing survey and coronagraphic observations, Roman will reveal new details about the diversity of planetary systems, showing how common solar systems like our own may be across the galaxy.
      Additional advances in coronagraph technology will be needed to build a coronagraph that can detect a planet like Earth. NASA is working on a concept for such a mission, currently named the Habitable Worlds Observatory.
      More about ExEP, NExScI 
      NASA’s Exoplanet Exploration Program is responsible for implementing the agency’s plans for the discovery and understanding of planetary systems around nearby stars. It acts as a focal point for exoplanet science and technology and integrates cohesive strategies for future discoveries. The science operations and analysis center for ExEP is NExScI, based at IPAC, a science and data center for astrophysics and planetary science at Caltech. JPL is managed by Caltech for NASA.
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      News Media Contact
      Calla Cofield
      Jet Propulsion Laboratory, Pasadena, Calif.
      626-808-2469
      calla.e.cofield@jpl.nasa.gov
      2025-119
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      Last Updated Sep 17, 2025 Related Terms
      Exoplanets Exoplanet Discoveries Gas Giant Exoplanets Jet Propulsion Laboratory Kepler / K2 Nancy Grace Roman Space Telescope Neptune-Like Exoplanets Super-Earth Exoplanets Terrestrial Exoplanets TESS (Transiting Exoplanet Survey Satellite) The Search for Life Explore More
      7 min read How NASA’s Roman Mission Will Unveil Our Home Galaxy Using Cosmic Dust
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    • By Amazing Space
      NASA / SPACEX CRS-23 ISS RESUPPLY LAUNCH LIVE
    • By NASA
      Northrop Grumman’s Cygnus cargo craft awaits its capture by the International Space Station’s Canadarm2 robotic arm, commanded by NASA astronaut Matthew Dominick on Aug. 6, 2024.Credit: NASA NASA, Northrop Grumman, and SpaceX are targeting no earlier than 6:11 p.m. EDT, Sunday, Sept. 14, for the next launch to deliver science investigations, supplies, and equipment to the International Space Station. The mission is known as NASA’s Northrop Grumman Commercial Resupply Services 23, or Northrop Grumman CRS-23.
      Watch the agency’s launch and arrival coverage on NASA+, Amazon Prime, and more. Learn how to watch NASA content through a variety of platforms, including social media.
      Filled with more than 11,000 pounds of supplies, the Northrop Grumman Cygnus XL spacecraft, carried on a SpaceX Falcon 9 rocket, will launch from Space Launch Complex 40 at Cape Canaveral Space Force Station in Florida. This mission will be the first flight of the Cygnus XL, the larger, more cargo-capable version of the company’s solar-powered spacecraft.
      Following arrival, astronauts aboard the space station will use the Canadarm2 to grapple Cygnus XL on Wednesday, Sept. 17, before robotically installing the spacecraft to the Unity module’s Earth-facing port for cargo unloading.
      Highlights of space station research and technology demonstrations, facilitated by delivery aboard this Cygnus XL, include materials to produce semiconductor crystals in space and equipment to develop improvements for cryogenic fuel tanks. The spacecraft also will deliver a specialized UV light system to prevent the growth of microbe communities that form in water systems and supplies to produce pharmaceutical crystals that could treat cancer and other diseases.
      Media interested in speaking to a science subject matter expert should contact Sandra Jones at: sandra.p.jones@nasa.gov. A copy of NASA’s media accreditation policy is available on the agency’s website.
      The Cygnus XL spacecraft is scheduled to remain at the orbiting laboratory until March before it departs and burns up in the Earth’s atmosphere. Northrop Grumman has named the spacecraft the S.S. William “Willie” McCool, in honor of the NASA astronaut who perished in 2003 during the space shuttle Columbia accident.
      NASA’s mission coverage is as follows (all times Eastern and subject to change based on real-time operations):
      Wednesday, Sept. 10:
      1 p.m. – International Space Station National Laboratory Science Webinar with the following participants:
      Dr. Liz Warren, associate chief scientist, NASA’s International Space Station Program Research Office Phillip Irace, science program director, International Space Station National Laboratory Paul Westerhoff, regents professor, School of Sustainable Engineering and the Built Environment, Arizona State University Robert Garmise, director of formulation development; exploratory biopharmaceuticals, Bristol Myers Squibb Joel Sercel, founder and CEO, TransAstra Corporation and Mike Lewis, senior vice president, customer innovation, Voyager Technologies Mohammad Kassemi, research professor, Case Western University Media who wish to participate must register for Zoom access no later than one hour before the start of the webinar.
      The webinar will be recorded and shared to the International Space Station National Lab’s YouTube channel following the event. Ask questions in advance using social accounts @ISS_CASIS and @Space_Station.
      Friday, Sept 12
      11:30 a.m. – Prelaunch media teleconference with the following participants:
      Dina Contella, deputy manager, NASA’s International Space Station Program Dr. Liz Warren, associate chief scientist, NASA’s International Space Station Program Research Office Ryan Tintner, vice president, Civil Space Systems, Northrop Grumman Jared Metter, director, Flight Reliability, SpaceX Media who wish to participate by phone must request dial-in information by 5 p.m., Thursday, Sept. 11, by contacting the NASA Johnson newsroom at 281-483-5111 or jsccommu@mail.nasa.gov.
      Audio of the teleconference will stream live on the agency’s website and YouTube.

      Sunday, Sept. 14:
      5:50 p.m. – Launch coverage begins on NASA+ and Amazon Prime
      6:11 p.m. – Launch
      Wednesday, Sept. 17:
      5 a.m. – Arrival coverage begins on NASA+ and Amazon Prime
      6:35 a.m. – Capture
      8 a.m. – Installation coverage begins on NASA+ and Amazon Prime
      NASA website launch coverage
      Launch day coverage of the mission will be available on the NASA website. Coverage will include live streaming and blog updates beginning no earlier than 5:50 p.m. on Sept. 14, as the countdown milestones occur. On-demand streaming video on NASA+ and photos of the launch will be available shortly after liftoff. For questions about countdown coverage, contact the NASA Kennedy newsroom at 321-867-2468. Follow countdown coverage on our International Space Station blog for updates.
      Attend Launch Virtually
      Members of the public can register to attend this launch virtually. NASA’s virtual guest program for this mission also includes curated launch resources, notifications about related opportunities or changes, and a stamp for the NASA virtual guest passport following launch.
      Watch, Engage on Social Media
      Let people know you’re watching the mission on X, Facebook, and Instagram by following and tagging these accounts:
       
      X: @NASA, @NASASpaceOps, @NASAKennedy, @Space_Station, @ISS_CASIS
      Facebook: NASA, NASAKennedy, ISS, ISS National Lab
      Instagram: @NASA, @NASAKennedy, @ISS, @ISSNationalLab
      Coverage en Espanol
      Did you know NASA has a Spanish section called NASA en Espanol? Check out NASA en Espanol on X, Instagram, Facebook, and YouTube for additional mission coverage.
      Para obtener información sobre cobertura en español en el Centro Espacial Kennedy o si desea solicitar entrevistas en español, comuníquese con Antonia Jaramillo o Messod Bendayan a: antonia.jaramillobotero@nasa.gov o messod.c.bendayan@nasa.gov.
      Learn more about the mission at:
      https://www.nasa.gov/mission/nasas-northrop-grumman-crs-23/
      -end-
      Josh Finch / Jimi Russell
      Headquarters, Washington
      202-358-1100
      joshua.a.finch@nasa.gov / james.j.russell@nasa.gov
      Steven Siceloff
      Kennedy Space Center, Fla.
      321-876-2468
      steven.p.siceloff@nasa.gov
      Sandra Jones / Joseph Zakrzewski
      Johnson Space Center, Houston
      281-483-5111
      sandra.p.jones@nasa.gov / joseph.a.zakrzewski@nasa.gov
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      Last Updated Sep 08, 2025 EditorLauren E. LowLocationNASA Headquarters Related Terms
      Northrop Grumman Commercial Resupply Commercial Resupply International Space Station (ISS) ISS Research View the full article
    • By Amazing Space
      LIVE DOCKING OF SPACEX DRAGON AT THE ISS
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