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In a world first, NASA has crashed a spacecraft into an asteroid in an attempt to push the rocky traveler off its trajectory. The Double Asteroid Redirection Test – or DART – is meant to test one potential approach that could prevent an asteroid from colliding with Earth. David Barnhart is a professor of astronautics at the University of Southern California and director of the Space Engineering Research Center there. He watched NASA’s live stream of the successful mission and explains what is known so far.

1. What do the images show?

The first images, taken by a camera aboard DART, show the double asteroid system of Didymos – about 2,500 feet (780 meters) in diameter – being orbited by the smaller asteroid Dimorphos that is about 525 feet (160 meters) long.

As the targeting algorithm on DART locked onto Dimorphos, the craft adjusted its flight and began heading towards the smaller of the two asteroids. The image taken at 11 seconds before impact and 42 miles (68 kilometers) from Dimorphos shows the asteroid centered in the camera’s field of view. This meant that the targeting algorithm was fairly accurate and the craft would collide right at the center of Dimorphos.

The second-to-last image, taken two seconds before impact shows the rocky surface of Dimorphos, including small shadows. These shadows are interesting because they suggest that the camera aboard the DART spacecraft was seeing Dimorphos directly on but the Sun was at an angle relative to the camera. They imply the DART spacecraft was centred on its trajectory to impact Dimorphos at the moment, but it’s also possible the asteroid was slowly rotating relative to the camera.

The final photo, taken one second before impact, only shows the top slice of an image but this is incredibly exciting. The fact that NASA received only a part of the image implies that the shutter took the picture but DART, traveling at around 14,000 miles per hour (22,500 kilometers per hour) was unable to transmit the complete image before impact.

2. What was supposed to happen?

The point of the DART mission was to test whether it is possible to deflect an asteroid with a kinetic impact – by crashing something into it. NASA used the analogy of a golf cart hitting the side of an Egyptian pyramid to convey the relative difference in size between tiny DART and Dimorphos, the smaller of the two asteroids. Prior to the test, Dimorphos orbited Didymos in roughly 16 hours. NASA expects the impact to shorten Dimorphos’ orbit by about 1 percent or roughly 10 minutes. Though small, if done far enough away from Earth, a nudge like this could potentially deflect a future asteroid headed towards Earth just enough to prevent an impact.

3. What do we know already?

The last bits of data that came from the DART spacecraft right before impact show that it was on course. The fact that the images stopped transmitting after the target point was reached can only mean that the impact was a success.

While there is likely a lot of information to be learned from the images taken by DART, the world will have to wait to learn whether the deflection was also a success. Fifteen days before the impact, DART released a small satellite with a camera that was designed to document the entire impact. The small satellite’s sensors should have taken images and collected information, but given that it doesn’t have a large antenna onboard, the images will be transmitted slowly back to Earth, one by one, over the coming weeks.

4. What does the test mean for planetary defense?

I believe this test was a great proof-of-concept for many technologies that the US government has invested in over the years. And importantly, it proves that it is possible to send a craft to intercept with a minuscule target millions of miles away from Earth. From that standpoint DART has been a great success.

Over the course of the next months and years, researchers will learn just how much deflection the impact caused – and most importantly, whether this type of kinetic impact can actually move a celestial object ever so slightly at a great enough distance to prevent a future asteroid from threatening Earth.


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Smithsonian Air and Space Museum Reopens with SpaceX Rocket, Mars Habitat and More

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Smithsonian Air and Space Museum Reopens with SpaceX Rocket, Mars Habitat and More

Hundreds waited at the ready outside the Smithsonian’s National Air and Space Museum on Monday (July 28), when “the doors opened for access to five featured and newly renovated galleries that capture the history, contemporary status, and futuristic vision of aviation and space exploration. These refurbished spaces showcase a mix of historic and high-tech artifacts such as John Glenn’s “Friendship 7” capsule, pieces of a SpaceX Falcon 9 rocket, and a 3D-printed Mars habitat. Visitors were among the first to experience a sweeping display of innovation, housed within the museum’s revitalised main building on the National Mall in Washington, D.C.

Smithsonian’s $900M Overhaul Brings Futuristic Space Exhibits and Aviation History to Life

As per a Smithsonian statement, the reimagined exhibits are part of a $900 million full-building transformation launched in 2018, scheduled for completion by July 2026—the museum’s 50th anniversary. This phase marks the second group of reopened galleries since the start of 2022. After a three-year closure, the north entrance opened for the first time, leading visitors through a newly wing-shaped vestibule and into “Boeing Milestones of Flight Hall”, now with improved lighting, digital screens, and iconic artefacts.

Next to it, a new “Futures in Space” gallery showcases domestic exhibitions from private space companies like SpaceX, Blue Origin, Virgin Galactic, and Axiom Space. Rather than a chronological or program-based layout, the gallery explores philosophical and practical questions about space: Who decides who goes? Why do we venture out? What will we do once we arrive? The immersive layout blends historical items, contemporary designs, and even pop culture references.

The museum has reopened galleries such as “Barron Hilton Pioneers of Flight”, “World War I: The Birth of Military Aviation”, and “Allan and Shelley Holt Innovations Gallery”, and the upgraded Lockheed Martin IMAX Theatre, praised as educational and inspirational.

Despite free entry, the Smithsonian Museum reopened to more than 6,000 guests, who must pick up timed-entry passes in order to better manage crowd flow.

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NASA’s Solar Observatory Sees Two Eclipses in One Day

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NASA’s Solar Observatory Sees Two Eclipses in One Day

NASA’s Solar Dynamics Observatory (SDO) has witnessed and recorded an unprecedented phenomenon of two solar eclipses in one day on July 25, 2025. These two eclipses took place only hours apart that day, and were photographed by SDO instruments pointed up and away from the Sun in geosynchronous orbit. First, around 2:45 UTC, the Moon passed between SDO and the Sun. Then, starting at about 6:30 UTC, Earth itself eclipsed the Sun from SDO’s point of view, with the Sun disappearing behind our planet shortly before 8:00 UTC. Since launching in 2010, SDO has continuously monitored the Sun’s activity, from solar flares to magnetic fields, helping forecasters predict space weather.

Moon Transit

According to NASA, SDO orbits Earth in a high geosynchronous orbit, so it has an almost constant view of the Sun. On July 25, this vantage point captured a partial solar eclipse as the Moon passed between the spacecraft and the Sun. NASA’s mission team had predicted this “lunar transit” would cover about 62% of the solar disk. Indeed, the Moon’s silhouette moved slowly across the Sun (around 2:45–3:35 UTC), blocking roughly two-thirds of the bright disk at maximum. The observatory’s ultraviolet telescope (AIA) recorded the event, revealing the Sun’s lower atmosphere and coronal loops around the sharply defined lunar edge. This transit was the deepest lunar eclipse SDO saw in 2025.

Earth’s Eclipse from Space

Hours later, on the same day, Earth itself passed between SDO and the Sun. Beginning around 6:30 UTC on July 25, our planet fully blocked the observatory’s view of the solar disk. This occurred during SDO’s regular eclipse season (a roughly three-week period twice each year when Earth’s orbit crosses the satellite’s line of sight). The total eclipse lasted until shortly before 8:00 UTC. In SDO’s images, Earth’s shadow has a fuzzy edge because our atmosphere scatters sunlight, in contrast to the Moon’s crisp eclipse.

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NISAR Launches July 30: A NASA-ISRO Satellite to Track Earth’s Changes

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NISAR Launches July 30: A NASA-ISRO Satellite to Track Earth’s Changes

The NASA-ISRO Synthetic Aperture Radar (NISAR) satellite, a joint Earth science mission, is now set for launch from India’s Satish Dhawan Space Centre. The pickup-truck-sized spacecraft was encapsulated in the nose cone of an Indian Geosynchronous Satellite Launch Vehicle and is scheduled to lift off on Wednesday, July 30 at 8:10 a.m. EDT (5:40 p.m. IST). Once in orbit, its dual-frequency radars will circle Earth 14 times a day, scanning nearly all of the planet’s land and ice surfaces every 12 days. It will provide data to help scientists monitor soil moisture and vegetation, and better assess hazards like landslides and floods.

International Collaboration and Launch Readiness

According to the official website, NISAR reflects a significant NASA–ISRO partnership. NASA’s Jet Propulsion Laboratory (JPL) built the long-wavelength L-band radar, and India’s Space Applications Centre built the shorter-wavelength S-band radar. This dual-frequency design makes NISAR the first Earth satellite to carry two radar systems, underscoring the mission’s unique collaboration.

The spacecraft is now integrated into its launch vehicle at India’s Satish Dhawan Space Centre. On July 28 NASA announced NISAR had been encapsulated in the payload fairing of an ISRO Geosynchronous Satellite Launch Vehicle on the pad. The GSLV is scheduled to lift off at 8:10 a.m. EDT (5:40 p.m. IST) on Wednesday, July 30.

Advanced Dual-Frequency Radar

NISAR carries a novel dual-frequency radar system. The satellite’s instruments operate at L-band (25 cm) and S-band (10 cm) wavelengths. The longer L-band waves can penetrate forests and soil to sense moisture and land motion, while the shorter S-band waves pick up fine surface details like vegetation moisture and roughness. This combination lets NISAR detect both large-scale and fine-scale changes.

From orbit, NISAR will circle Earth 14 times per day, scanning nearly all land and ice surfaces twice every 12 days. Its data will track changes like the advance or retreat of polar ice sheets and slow ground shifts from earthquakes, and will also aid agriculture and disaster planning by helping monitor crops and prepare for floods and hurricanes.

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