Near earth objects 2023

NASA's top expert on near-Earth objects says that new telescope systems, including a "last alert" system that's just now being set up, are gradually getting a handle on potentially threatening asteroids. But comets? That's a completely different story."We can do something about asteroids. Comets are a problem," said Donald Yeomans, the head of the Near-Earth Object Program at NASA's Jet Propulsion Laboratory in Pasadena, Calif.Yeomans is the author of "Near-Earth Objects: Finding Them Before They Find Us," a new book sizing up the cosmic perils posed by asteroids and comets — and looking ahead to the potential they offer for scientific discovery and economic exploitation.For an example of the perils, you need look no further than the dinosaurs — or, more accurately, the lack thereof. Scientists believe an asteroid impact along the coast of Mexico's Yucatan Peninsula set off a chain of events that killed off the dinosaurs and many other species 65 million years ago. A much smaller impact in 1908 blew down half a million acres' worth of trees in Siberia, and could have leveled a city nearly the size of Tokyo if its trajectory were different.Donald Yeomans is manager of Near Earth Object Program Office.NASA / JPL-Caltech"Near-Earth Objects" focuses on the peril and the potential of asteroids and comets.Princeton U. PressMore recently, astronomers have sounded a series of alerts over close encounters with passing asteroids — including three cases involving the asteroids 2012 DA14, 2011 AG5 and Apophis. It turns out that none of those space rocks will hit us in the foreseeable future, but 2012 DA14 is due to come within 13,000 miles on Feb. 15. That's closer than the orbits for geosynchronous satellites. And experts agree it's only a matter of time before astronomers find a large asteroid that's actually on a collision course.This is why Congress asked NASA in 1998 to identify 90 percent of the asteroids wider than a kilometer (0.6 miles). In 2011, NASA researchers declared that they achieved that goal. But they still have a long way to go to identify the smaller threats: The experts estimate that there are more than a million near-Earth asteroids capable of causing damage on the scale of 1908's Siberian fireball.Several projects are in the works to catalog those smaller asteroid threats, including some projects that are funded by NASA's observation program for near-Earth objects, which is allocated more than $20 million annually. One such program — known as the Asteroid Terrestrial-impact Last Alert System, or ATLAS — started receiving NASA funding just this month. The $5 million, five-year effort calls for building telescopes in Hawaii that could provide advance warning for the kinds of asteroids that have eluded bigger detection programs."We think it's possible

Georgina RannardClimate and science reporterGetty ImagesA large asteroid known as 2024 YR4 has grabbed headlines this week as scientists first raised its chances of hitting earth, then lowered them.The latest estimate says the object has a 0.28% chance of hitting Earth in 2032, significantly lower than the 3.1% chance earlier in the week.Scientists say it is now more likely to smash into the Moon, with Nasa estimating the probability of that happening at 1%.But in the time since 2024 YR4 was first spotted through a telescope in the desert in Chile two months ago, tens of other objects have passed closer to Earth than the Moon, which in astronomical terms sounds like a near miss.It is likely that others, albeit much smaller, have hit us or burned up in the atmosphere but gone unnoticed.This is the story of the asteroids that you never hear about – the fly-bys, the near-misses and the direct hits. The vast majority are harmless. But some carry the most valuable clues for unlocking mysteries in our universe, information we are desperate to get our hands on.Drs. Bill and Eileen Ryan, Magdalena Ridge Observatory 2.4m Telescope, New Mexico Tech2024 YR4 was first detected in December and there is small chance it could hit Earth on 22 December 2032Asteroids, also sometimes called minor planets, are rocky pieces left over from the formation of our solar system about 4.6 billion years ago.Rocks routinely orbit close to Earth, pushed by the gravity of other planets. For most of human history, it has been impossible to know how close we have come to being struck by a large asteroid. Serious monitoring of objects near Earth only started in the late 20th century, explains Professor Mark Boslough from the University of New Mexico. "Before that we were blissfully oblivious to them," he says.We now know that quite large objects - 40m across or more - pass between Earth and the Moon several times a year. That's the same size of asteroid that exploded over Siberia in 1908 injuring people and damaging buildings over 200 square miles.The most serious near-miss, and the closest comparison with YR4, was an asteroid called Apophis which was first spotted in 2004 and measured 375 meters across, or around the size of a cruise ship.Professor Patrick Michel from French National Centre for Scientific Research (CNRS) tracked Apophis and recalls it was considered the most hazardous asteroid ever detected.It took until 2013 to get enough observations to understand that it was not going to hit Earth.But he says there was one big difference with YR4. "We didn't know what to do. We discovered something, we determined an impact probability, and then thought, who do we call?" he says. Scientists and governments had no idea how to respond, he says.A large asteroid strike could be catastrophic if it hits an area where humans live. We don't know exactly how big YR4 is yet, but if it is at the top end of estimates, about 90m across, it would likely

Or different from an electrical interaction? Explain. Tutorials in JntroducJOry Physics McDennott, Shaffer, & P.E.G., U. Wash. ©Prentice Hall, Inc. First Edition, 2002 Magnets and magnetic fields EM 115 II. Magnetic fields We have observed that magnets interact even when they are not in direct contact. In electrostatics we used the idea of an electric field to account for the interaction between charges that were separated from one another. For magnetic interactions, we similarly define a magnetic field. A. Obtain a compass from a tutorial instructor. 1. Use the compass to explore the region around a bar magnet. Describe the behavior of the compass needle both near the poles of the magnet and in the region between the poles. To which class of objects from section I does the compass needle belong? Explain. 2. Move the compass far away from all other objects. Shake the compass and describe the behavior of the compass needle. Does the needle behave as if it is in a magnetic field? We can account for the behavior of the compass needle by supposing that it interacts with the Earth and that the Earth belongs to one of the categories from section I. To which class of objects from section I do your observations suggest the Earth belongs? Explain how you can tell. 3. We define the north pole of a magnet as the end that points toward the arctic region of the Earth when the magnet is free to rotate and is not interacting with

Massive 800-foot asteroid closely past the Earth. (Credit- Freepik)A huge stadium-sized space rock, the Asteroid 2023 SP1 cruised towards the Earth at a close distance today, NASA has confirmed. Asteroids, the rocky remnants of our solar system's formation, have left a deep mark on Earth in the form of craters, some colossal, some barely appearing on the landscape. These craters tell stories of scary collisions. Smaller asteroids, mere pebbles in the cosmic game, create fleeting streaks of light as meteors before burning up in our atmosphere. These leave behind no permanent mark, except for the occasional meteorite, a piece that survives the fiery destruction. Thankfully, the massive 800-foot asteroid escaped the Earth. Here is what NASA has revealed.Asteroid 2023 SP1: Key CharacteristicsAccording to NASA CNEOs data, this 800-foot extremely massive stadium-sized near-Earth object travelled towards Earth at a furious speed of 42480 kilometres per hour. The space rock made its closest approach to Earth today, February 7, 2024, passing at a close distance of a mere 3.41 million miles. And yes, the Asteroid 2008 OS7 was classified as a Potentially Hazardous Asteroid (PHA) by NASA's Center for Near-Earth Object Studies (CNEOS) due to its huge size and close approach towards the Earth.Asteroids and their potential to impact EarthMassive asteroids have played a significant role in shaping the history of Earth, both in terms of geological processes and the evolution of life. These celestial bodies, often remnants from the early solar system, are composed of rock, metal, and other materials. While most asteroids are relatively small and orbit the Sun within the asteroid belt between Mars and Jupiter, there is a potential threat posed by larger asteroids that could collide with Earth. Their impact on Earth has the potential to cause catastrophic consequences.The potential risk of a massive asteroid impact remains a concern, and ongoing research and preparedness are crucial to understanding and mitigating this potential threat. Advances in technology and international collaboration will continue to play a vital role in monitoring and responding to the ever-present cosmic hazards that our planet faces.

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