Tereza is a London-based science and technology journalist, aspiring fiction writer and amateur gymnast. Originally from Prague, the Czech Republic, she spent the first seven years of her career working as a reporter, script-writer and presenter for various TV programmes of the Czech Public Service Television.
Scientists are studying how sensors designed to detect nuclear tests could help track space junk and meteorites crashing down in the world's most remote regions.
"The advantage of using the regional and global infrasound sensor network for studying trajectories of bolides and space debris is that it provides truly worldwide coverage operating continuously day and night and in all weather conditions," Elizabeth Silber, a scientist at Sandia National Laboratories in the U.S., told Space.com.
They found that while trajectories of space rocks and junk that fall into the atmosphere at steep angles of 60 degrees or more are easy to reconstruct from infrasound measurements, the same doesn't apply to objects flying through the atmosphere at shallower angles. "At distant observing stations, signals from different segments of that long trajectory can dominate, causing significant variability and uncertainty in the measured arrival directions," Silber explained.
"Objects re-entering from low Earth orbit generally do so at extremely shallow angles," Silber said."This is because their orbits decay gradually due to atmospheric drag, causing them to spiral inward over time rather than plunging steeply."Most meteorites, too, enter at angles smaller than 60 degrees, with 45 degrees being the most common angle at which space rocks hit the atmosphere, Silber admitted.
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