NASA | Massive Black Hole Shreds Passing Star
This artist’s rendering illustrates new findings about a star shredded by a black hole. When a star wanders too close to a black hole, intense tidal forces rip the star apart. In these events, called “tidal disruptions,” some of the stellar debris is flung outward at high speed while the rest falls toward the black hole. This causes a distinct X-ray flare that can last for a few years. NASA’s Chandra X-ray Observatory, Swift Gamma-ray Burst Explorer, and ESA/NASA’s XMM-Newton collected different pieces of this astronomical puzzle in a tidal disruption event called ASASSN-14li, which was found in an optical search by the All-Sky Automated Survey for Supernovae (ASAS-SN) in November 2014. The event occurred near a supermassive black hole estimated to weigh a few million times the mass of the sun in the center of PGC 043234, a galaxy that lies about 290 million light-years away. Astronomers hope to find more events like ASASSN-14li to test theoretical models about how black holes affect their environments.
During the tidal disruption event, filaments containing much of the star's mass fall toward the black hole. Eventually these gaseous filaments merge into a smooth, hot disk glowing brightly in X-rays. As the disk forms, its central region heats up tremendously, which drives a flow of material, called a wind, away from the disk.
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Mars Science Laboratory Curiosity Rover Animation
This 11-minute animation depicts key events of NASA's Mars Science Laboratory mission, which will launch in late 2011 and land a rover, Curiosity, on Mars in August 2012.
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Black Hole Snack Attack
Using NASA’s Neil Gehrels Swift Observatory, which launched in 2004, scientists have discovered a black hole in a distant galaxy repeatedly nibbling on a Sun-like star. The object heralds a new era of Swift science made possible by a novel method for analyzing data from the satellite’s X-ray Telescope (XRT).
When a star strays too close to a monster black hole, gravitational forces create intense tides that break the star apart into a stream of gas. The leading edge swings around the black hole, and the trailing edge escapes the system. These destructive episodes are called tidal disruption events. Astronomers see them as flares of multiwavelength light created when the debris collides with a disk of material already orbiting the black hole.
Recently, astronomers have been investigating variations on this phenomena, which they call partial or repeating tidal disruptions.
During these events, every time an orbiting star passes close to a black hole, the star bulges outward and sheds material, but survives. The process repeats until the star looses too much gas and finally breaks apart. The characteristics of the individual star and black hole system determine what kind of emission scientists observe, creating a wide array of behaviors to categorize.
On June 22, 2022, XRT captured Swift J0230 for the first time. It lit up in a galaxy around 500 million light-years away in the northern constellation Triangulum. Swift’s XRT has observed nine additional outbursts from the same location roughly every few weeks.
Scientists propose that Swift J0230 is a repeating tidal disruption of a Sun-like star orbiting a black hole with over 200,000 times the Sun’s mass. They estimate the star loses around three Earth masses of material on each pass. This system provides a bridge between other types of suspected repeating disruptions and allowed scientists to model how interactions between different star types and black hole sizes affect what we observe.
Swift J0230’s discovery was possible thanks to a new, automated search of XRT observations called the Swift X-ray Transient Detector.
After the instrument observes a portion of the sky, the data is transmitted to the ground, and the program compares it to previous XRT snapshots of the same spot. If that portion of the X-ray sky has changed, scientists get an alert. In the case of Swift J0230, astronomers were able to rapidly coordinate additional observations of the region.
Music credit: "Teapot Waltz" by Benjamin Parsons from Universal Production Music
Credit: NASA's Goddard Space Flight Center
Producer: Sophia Roberts (AIMM)
Science writer: Jeanette Kazmierczak (University of Maryland College Park)
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Epic Shot! NASA and NBA Demonstrate "Nothin' But Net"
To become United States' first-ever mission to return an asteroid sample to Earth, NASA OSIRIS-REx must make all the right moves to shoot the sample return capsule through a 'space hoop' to land within a 250 square mile patch in the Utah desert. NASA invited Deni Avdija from the NBA's Washington Wizards to demonstrate what it takes to make the perfect shot.
Credit: NASA's Goddard Space Flight Center
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Music is "Eyes on the Target" by Jeremy Holland Smith and "I Gotta Rise Up" by Bachi and Brett Engel of Universal Production Music.
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Expansion Rate: The Hubble Tension
When the Hubble Space Telescope launched, one of its main goals was to measure the rate at which our universe is expanding.
That rate is called the “Hubble Constant” – named after the astronomer Edwin Hubble, who contributed to the discovery of the universe’s expansion. However, the expected value of the expansion rate is different depending on what equipment is being used to determine it.
In this video, Nobel Laureate Dr. Adam Riess explains this phenomenon known as “Hubble Tension,” and how important this mystery is to our understanding of the universe.
For more information, visit https://nasa.gov/hubble.
Credit: NASA's Goddard Space Flight Center
Producer & Director: James Leigh
Editor: Lucy Lund
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Hubble Space Telescope Animation
Credit: M. Kornmesser (ESA/Hubble)
Dark Energy Expansion Graph
Credit: NASA's Goddard Space Flight Center
Dark Energy Expansion Animation
Credit: NASA's Goddard Space Flight Center Conceptual Image Lab
Hubble Extreme Deep Field Fly Through
Credit: NASA, ESA, and F. Summers, L. Frattare, T. Davis, Z. Levay, and G. Bacon (Viz3D Team, STScI)
James Webb Space Telescope Animations
Credit: NASA's Goddard Space Flight Center Conceptual Image Lab
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“Fuel” and Fire: NASA’s Artemis Missions to the Moon, feat. Metallica
What do Metallica and NASA’s Artemis missions to the Moon have in common? Both love “Fuel” and fire. See footage of the Artemis I launch scored by Metallica’s “Fuel.”
Learn more about how NASA’s Space Launch System (SLS) rocket and Orion spacecraft will send four astronauts on a lunar flyby around the Moon for NASA’s Artemis II mission: https://nasa.gov/sls
Credit: NASA/Brandon Hancock and Sam Lott
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Our SpaceX Crew-6 Mission Safely Returns to Earth on This Week @NASA – September 8, 2023
Our SpaceX Crew-6 mission safely returns to Earth, the tech demo hitching a ride on our Psyche spacecraft, and studying ancient life on Earth to better understand Mars … a few of the stories to tell you about – This Week at NASA! Video Producer: Andre Valentine
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Music: Universal Production Music
Credit: NASA
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