Andrew Dollar
- Indexed articles, last 90 days
- 10
- Latest publication
- Sep 30, 2026
- Outlet visibility, for NASA Science
- Top 50K sites
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- Jul 8, 2026
Latest articles
Help Overlap Zoo Reveal Cosmic Dust - NASA Science (opens the original)
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Galaxies, vast collections of billions of stars, gas, and dust held together by gravity, are scattered across the immensity of space. But every so often, a coincidence occurs: Two galaxies line up from our point of view on Earth (or from a space telescope) and appear to overlap in the sky. These rare overlapping galaxies give astronomers a chance to study something normally difficult to see: the dust inside one of these distant cosmic objects. That’s the focus of NASA’s new Overlap Zoo project.
Circling the Black Hole at the Photon Sphere - NASA Science (opens the original)
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You currently sit at the black hole's photon sphere, where light can travel endlessly in a circle due to the star's great gravitational pull. The apparent position of the photon sphere is always easy to spot - it is the apparent dividing line between black hole and sky. As you circle the black hole the sky appears to move in strange ways. Here an Einstein ring for background stars can be seen as an invisible line above the photon sphere horizon. Stars approaching the exact other side of the blac
Circling the Black Hole - NASA Science (opens the original)
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The first frame shows a background sky highly distorted by the black hole in the center. The gravity of the black hole is so great that it actually deflects the background starlight. Large light bending effects cause the background sky to appear to move in unusual ways as you circle the black hole. Light paths are so curved that light can reach you from anywhere on the sky - even from behind the black hole - no part of the sky is eclipsed. Distant starlight has fallen to you and therefore appear
Help Refine Data from Space Telescopes with Artifact InSPECtor - NASA Science (opens the original)
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How do scientists studying space with data from a telescope hundreds of thousands of miles away know that what they are seeing is real? A new NASA project, Artifact InSPECtor, invites you to find out – and by doing so, to help missions like Euclid and NASA’s new Nancy Grace Roman Space Telescope answer fundamental questions about our universe. "It’s really cool that we can help teach computers new skills," said nine-year-old Maeve F. after trying out Artifact InSPECtor. Participants of all ages,
Integrating Model-Based Systems Engineering and Fault Management to Enable Autonomous Space Missions - NASA Science (opens the original)
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Fully autonomous space mission operations require the ability to detect faults and compensate for them without human intervention. To address this challenge and provide model-based support for system design and operations, it is important to connect fault management (FM) and model-based systems engineering (MBSE). This approach was successfully demonstrated with the model-based generation of a failure modes and effects analysis and fault trees using NASA’s HelioSwarm mission early design informa
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