Astronomers observe star throw ‘invading comet’ at Earth for first time

BEIJING, Dec. 13 (Xinhua) — Stars and comets are unlikely to become “space dance partners”, according tomedia reports, and their gravitational partnership has long been suspected by astronomers, but has not been observed before. Now, for the first time, a team of Polish researchers has discovered two neighboring stars that appear to be pulling their “cold dance partners” and then ruthlessly throwing them in the direction of Earth.

Astronomers observe star throw 'invading comet' at Earth for first time

Now, for the first time, a team of Polish researchers has discovered two neighboring stars that appear to be pulling their “cold dance partners” and then ruthlessly throwing them in the direction of Earth.

Astronomers observe star throw 'invading comet' at Earth for first time

The Ott Nebula is a long-cycle comet “warehouse” where comets orbit the sun for more than 200 years a week.

Astronomers who studied the motion of more than 600 stars within 13 light-years of the sun discovered the pair’s combination, a finding that confirmed a theory of half a century ago and proved that such star dances were rare.

The Ott Nebula on the edge of the solar system, like a “wall flower” (no dance partner, no people sitting and watching) is quietly watching on the “planetary dance floor”, a legacy of the formation of the solar system, forming a huge shell that envelops our solar system, 66 times the distance from the Sun (14.9 trillion kilometers) from the Sun. Astronomers believe the Ott Nebula is a “warehouse” for long-cycle comets that orbit the sun for more than 200 years a week. Comet Hale-Bopp, which takes 2,500 years to orbit the sun, is one of the longest-lived comets ever discovered.

Since astronomer Jan Oort first suggested the existence of the Ott Nebula in the 1950s, astronomers have speculated that stars in neighboring solar systems may have pulled comets and thrown them toward the inner solar system, causing violent vibrations in the inner solar system. Comets that break through the night sky can often be observed from the Earth’s perspective, and their stunning sights are breathtaking. Astronomers spent years searching for evidence of these “star dances” until a recent Polish team of researchers first discovered the presence of two neighboring stars.

The new study, published in the Monthly Notices of the Royal Astronomical Society, describes how astronomers calculate the orbits of nearly 650 stars, while comparing the orbits of more than 270 long-cycle comets. At the same time, the study used an observation of the Gaia spacecraft, which measured about 1.7 billion objects, and surveyed Pan-STARRS, which is important for the search for asteroids, comets and other small objects in the solar system.

The Polish team modeled a pair of newly discovered stars-comets in an attempt to restore their historical information, and then “removed” a star from the model to see if the orbit of the comet’s companion changed, and if so, it would mean that the star might collide with the comet. The current Ott Nebula mechanism is not suitable for all observed comets, and the collective gravitational action of more distant stars may push them into long-cycle orbits, which, once a comet enters the solar system, will be disturbed by the gravitational pull of planets in the solar system.

Creating a computer model of the “star-comet dance” to observe all the effects, known as the Multi-Astro model, is a more complex and computationally intensive project, and astronomers do not fully grasp the information about each star, which, based on current observations, has to rely on star mass, They used star simulations to help learn more about the interactions between stars and comets. (Ye Ding Cheng)

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