Earlier reports Convert Day of Year The Hubble Space Telescope Unlocking the Secrets of the Universe Daily Report #10746 Period Covered: 07:00 PM December 14, 2025 - 06:59 PM December 15, 2025 (DOY 349/0000z - 349/2359z) Program Principal Investigator Program Title Science Observations Scheduled 16743 Taylor Hoyt, University of California - Berkeley A High-accuracy, Geometric Calibration of the Tip of the Red Giant Branch in the Halo of NGC 4258 17207 David Rubin, University of Hawaii ...Continue Reading

INBOX ASTRONOMY NASA’s Webb Observes Exoplanet Whose Composition Defies Explanation Release date: Tuesday, December 16, 2025 10:00:00 AM Eastern Standard Time Bizarre, lemon-shaped world has an atmosphere unlike any ever seen before. In a finding scientists call “an absolute surprise,” a team using NASA’s James Webb Space Telescope has uncovered a rare type of exoplanet whose atmospheric composition challenges current theories of how the planet could have formed. This Jupiter-mass body appears to have an ex ...Continue Reading

Earlier reports Convert Day of Year The Hubble Space Telescope Unlocking the Secrets of the Universe Daily Report #10745 Period Covered: 07:00 PM December 13, 2025 - 06:59 PM December 14, 2025 (DOY 348/0000z - 348/2359z) Program Principal Investigator Program Title Science Observations Scheduled 17308 Cameron Lemon, Stockholm University An HST Gap Program for lensed Quasars 17310 Michael Koss, Eureka Scientific Inc. A Blue Gap Survey of Nearby Active Galaxies 17511 Jaya Maithi ...Continue Reading

Earlier reports Convert Day of Year The Hubble Space Telescope Unlocking the Secrets of the Universe Daily Report #10745 Period Covered: 07:00 PM December 13, 2025 - 06:59 PM December 14, 2025 (DOY 348/0000z - 348/2359z) Program Principal Investigator Program Title Science Observations Scheduled 17308 Cameron Lemon, Stockholm University An HST Gap Program for lensed Quasars 17310 Michael Koss, Eureka Scientific Inc. A Blue Gap Survey of Nearby Active Galaxies 17511 Jaya Maithi ...Continue Reading

INBOX ASTRONOMY NASA's Roman Telescope Will Observe Thousands of Newfound Cosmic Voids Release date: Monday, December 15, 2025 10:00:00 AM Eastern Standard Time The resulting “big data” will help illuminate the nature of dark energy. What do fizzing champagne glasses and our universe have in common? They’re both full of bubbles! The cosmic bubbles are vast structures hundreds of millions of light-years across. Their walls are outlined by collections of galaxies. The details of these bubbles – their size, sh ...Continue Reading

Earlier reports Convert Day of Year The Hubble Space Telescope Unlocking the Secrets of the Universe Daily Report #10744 Period Covered: 07:00 PM December 12, 2025 - 06:59 PM December 13, 2025 (DOY 347/0000z - 347/2359z) Program Principal Investigator Program Title Science Observations Scheduled 17309 Vihang Mehta, California Institute of Technology Resolved imaging survey of the analogs of high-z massive, star-forming clumps 17511 Jaya Maithil, Smithsonian Institution Astrophysical Ob ...Continue Reading

Earlier reports Convert Day of Year The Hubble Space Telescope Unlocking the Secrets of the Universe Daily Report #10743 Period Covered: 07:00 PM December 11, 2025 - 06:59 PM December 12, 2025 (DOY 346/0000z - 346/2359z) Program Principal Investigator Program Title Science Observations Scheduled 17309 Vihang Mehta, California Institute of Technology Resolved imaging survey of the analogs of high-z massive, star-forming clumps 17414 Laura Kreidberg, Max Planck Institute for Astronomy ...Continue Reading

Earlier reports Convert Day of Year The Hubble Space Telescope Unlocking the Secrets of the Universe Daily Report #10742 Period Covered: 07:00 PM December 10, 2025 - 06:59 PM December 11, 2025 (DOY 345/0000z - 345/2359z) Program Principal Investigator Program Title Science Observations Scheduled 17703 Annalisa De Cia, European Southern Observatory - Germany STIS-ISM: STIS ISM Survey in the Milky Way 17804 R. O. Loyd, Eureka Scientific Inc. STELa: Survey of Transiting Exoplanets in L ...Continue Reading

Earlier reports Convert Day of Year The Hubble Space Telescope Unlocking the Secrets of the Universe Daily Report #10741 Period Covered: 07:00 PM December 09, 2025 - 06:59 PM December 10, 2025 (DOY 344/0000z - 344/2359z) Program Principal Investigator Program Title Science Observations Scheduled 17410 Ryan Foley, University of California - Santa Cruz Reducing Type Ia Supernova Distance Biases by Separating Reddening and Intrinsic Color 17467 Tom Megeath, University of Toledo An HST ...Continue Reading

JWST Observer Latest News Presentations from the 19th JSTUC Meeting Are Now Available The latest JSTUC meeting included presentations on JWST Mission updates, Cycle 5 results, Cycle 6 plans, policy changes for the Director's Discretionary programs, grants allocations, and various other updates. View All JWST Observer News ...Continue Reading