![]() NASA's Hubble Space Telescope could potentially do the job, he added. Still, if the Venus-neighborhood asteroid population exists, "we should be able to find it," Pokorný said. And it's tough to spot asteroids interior to Earth's orbit, because they get lost in the sun's blinding glare, the researchers said. It wouldn't be shocking for this little asteroid colony to have evaded detection for starters, nobody has really searched for such rocks before. In the simulation, about 800 of these space rocks survived to the present day, suggesting that such a population may indeed exist in the orbital path of Earth's sister planet. ![]() So, the duo built another model, which followed 10,000 hypothetical Venus-orbit asteroids through 4.5 billion years of solar system history. "We got excited, but then you realize, 'Oh, there's so much work to do.'" "We thought we'd discovered this population of asteroids, but then had to prove it and show it works," Pokorný, the study's lead author, said in the same statement. The researchers' simulations identified the probable culprit: a population of undiscovered asteroids zipping around the sun in Venus' path. "So, we started making up our own sources of dust." The scientists modeled all of the potential dust sources they could think of - objects in the main asteroid belt between Mars and Jupiter (the chief source of Earth's co-orbiting ring), Oort Cloud comets, Jupiter-family comets and more. In the second paper, Kuchner and fellow NASA Goddard astrophysicist Petr Pokorný set out to understand where the dust in the Venus-orbit ring came from. And if you packed all of that ring's dust together, you'd get an asteroid just 2 miles (3.2 km) across. For example, Venus' co-orbiting halo is just 10 percent denser than the surrounding space, NASA officials said in the same statement. The Mercury-orbit ring is quite a bit smaller than the halo that shares Venus' path, which, while just 6 million miles (10 million km) across, spans 16 million miles (26 million km) from top to bottom.īut such dust rings are extremely diffuse. The researchers reported their results last November in The Astrophysical Journal. The team calculated that the dust ring is about 9.3 million miles (15 million kilometers) wide. That said something was there, and it's something that extends all around the sun." ![]() "All around the sun, regardless of the spacecraft's position, we could see the same 5 percent increase in dust brightness, or density. "It wasn't an isolated thing," co-author Russell Howard, also a solar scientist at the Naval Research Laboratory, said in the same statement. When they applied the model to the STEREO imagery, the astronomers saw dust - a lot more of it than they anticipated. The researchers created a model based on these photos in an attempt to "edit out" dust that could make it more difficult to understand the data gathered by STEREO, NASA's recently launched Parker Solar Probe and other sun-studying craft. The researchers analyzed images captured by one of NASA's twin Solar and Terrestrial Relations Observatory (STEREO) spacecraft, both of which launched into orbit around the sun in 2006. "They expected that the solar wind and magnetic forces from the sun would blow any excess dust at Mercury's orbit away."īut Stenborg and his colleagues shattered that expectation. "People thought that Mercury, unlike Earth or Venus, is too small and too close to the sun to capture a dust ring," Guillermo Stenborg, a solar scientist at the Naval Research Laboratory in Washington, D.C., said in the same statement.
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