NASA Astronomy Picture of the Day

September 24, 2025

GW250114: Rotating Black Holes Collide

It was the strongest gravitational wave signal yet measured – what did it show? GW250114 was detected by both arms of the Laser Interferometer Gravitational-wave Observatory (LIGO) in Washington and Louisiana USA earlier this year. Analysis showed that the event was created when two black holes, each of mass around 33 times the mass of the Sun, coalesced into one larger black hole with a mass of around 63 solar masses. Even though the event happened about a billion light years away, the signal was so strong that the spin of all black holes, as well as initial ringing of the final black hole, was deduced with exceptional accuracy. Furthermore, it was confirmed better than before, as previously predicted, that the total event horizon area of the combined black hole was greater than those of the merging black holes. Featured, an artist's illustration depicts an imaginative and conceptual view from near one of the black holes before collision.

https://apod.nasa.gov/apod/astropix.html

https://www.nasa.gov/news-release/nasa-noaa-launch-three-spacecraft-to-map-suns-influence-across-space/

https://www.floridatoday.com/story/tech/science/space/spacex/2025/09/24/spacex-launches-nasa-imap-mission-florida-sunrise-sun-kennedy-space-center/86277119007/

https://www.youtube.com/watch?v=vNRrfamTT4k

https://science.nasa.gov/sun/

NASA, NOAA Launch Three Spacecraft to Map Sun’s Influence Across Space

Sep 24, 2025

NASA and the National Oceanic and Atmospheric Administration (NOAA) launched three new missions Wednesday to investigate the Sun’s influence across the solar system.

At 7:30 a.m. EDT, a SpaceX Falcon 9 rocket lifted off from Launch Complex 39A at NASA’s Kennedy Space Center in Florida carrying the agency’s IMAP (Interstellar Mapping and Acceleration Probe), Carruthers Geocorona Observatory, and NOAA’s SWFO-L1 (Space Weather Follow On-Lagrange 1) spacecraft.

“This successful launch advances the space weather readiness of our nation to better protect our satellites, interplanetary missions, and space-faring astronauts from the dangers of space weather throughout the solar system,” said acting NASA Administrator Sean Duffy, “This insight will be critical as we prepare for future missions to the Moon and Mars in our endeavor to keep America first in space.”

These missions will help safeguard both our ground-based technology, as well as our human and robotic space explorers from the harsh conditions known of space weather.

“As the United States prepares to send humans back to the Moon and onward to Mars, NASA and NOAA are providing the ultimate interplanetary survival guide to support humanity’s epic journey along the way,” said Nicola Fox, associate administrator, Science Mission Directorate at NASA Headquarters in Washington.

“Our scientific discoveries and technical innovations directly feed into our know-before-you-go roadmap to ensure a prepared, safe, and sustained human presence on other worlds.”

New science to protect society

Each mission will investigate different effects of space weather and the solar wind, which is a continuous stream of particles emitted by the Sun, from their origins at the Sun all the way outward to interstellar space.

“These three unique missions will help us get to know our Sun and its effects on Earth better than ever before,” said Joe Westlake, Heliophysics Division director at NASA Headquarters.

“This knowledge is critical because the Sun’s activity directly impacts our daily lives, from power grids to GPS. These missions will help us ensure the safety and resilience of our interconnected world.”

The IMAP mission will chart the boundary of the heliosphere, a bubble inflated by the solar wind that shields our solar system from galactic cosmic rays — a key protection that helps make our planet habitable.

In addition, the spacecraft will sample and measure solar wind particles streaming outward from the Sun, as well as energetic particles streaming inward from the boundary of our solar system and beyond.

1/2

>>23647215

“IMAP will help us better understand how the space environment can harm us and our technologies, and discover the science of our solar neighborhood,” said David McComas, IMAP mission principal investigator at Princeton University in New Jersey.

The Carruthers Geocorona Observatory is the first mission dedicated to recording changes in the outermost layer of our atmosphere, the exosphere, which plays an important role in Earth’s response to space weather.

By studying the geocorona — the ultraviolet glow given off by the exosphere when sunlight shines on it — the Carruthers mission will reveal how the exosphere responds to solar storms and how it changes with the seasons.

The mission builds on the legacy of the first instrument to image the geocorona, which flew to the Moon aboard Apollo 16 and was built and designed by scientist, inventor, engineer, and educator Dr. George Carruthers.

“The Carruthers mission will show us how the exosphere works and will help improve our ability to predict the impacts of solar activity here on Earth,” said Lara Waldrop, the mission’s principal investigator at the University of Illinois at Urbana-Champaign.

The first of its kind, NOAA’s SWFO-L1 is designed to be a full-time operational space weather observatory. By keeping a watchful eye on the Sun’s activity and space conditions near Earth 24/7, and without interruption or obstruction, SWFO-L1 will provide quicker and more accurate space weather forecasts than ever before.

“This is the first of a new generation of NOAA space weather observatories dedicated to 24/7 operations, working to avoid gaps in continuity.

Real-time observations from SWFO-L1 will give operators the trusted data necessary to issue advance warnings so that decision-makers can take early action to protect vital infrastructure, economic interests, and national security on Earth and in space.

It’s about safeguarding society against space weather hazards,” said Richard Ullman, deputy director of the Office of Space Weather Observations at NOAA.

Next steps

In the hours after launch, all three spacecraft successfully deployed from the rocket and sent signals to Earth to confirm they’re active and working well.

Over the next few months, the spacecraft will make their way to their destination — a location between Earth and the Sun, about a million miles from Earth, called Lagrange point 1 (L1).

They should arrive by January and, once their instrument checkouts and calibrations are complete, begin their missions to better understand space weather and protect humanity.

David McComas of Princeton University leads the IMAP mission with an international team of 27 partner institutions. The Johns Hopkins Applied Physics Laboratory in Laurel, Maryland, built the spacecraft and will operate the mission.

2/2