The
study of comets, which take about 200 years and more to circulate
around the sun is very difficult, because it spends most of its life
away from the Earth in the solar system, so these comets with
long-period comets do not approach the sun during the life of a person
on Earth ,
It swims in the Oort Cloud, which is made up of a huge number of
gigantic glaciers that are about 300 billion kilometers away from the
sun and that move around the sun for a very long time of thousands,
sometimes millions of years. NASA's
WISE spacecraft, which scans the entire sky at infrared wavelengths,
has provided new insights into these distant ice bodies. Scientists have
found that the diameter of comets with long-range orbits, The
researchers also found that the average number of comets on average is
up to twice that of the Jupiter family comets, whose orbits are shaped
by Jupiter's attractiveness and have a lower circulation than 20 years."The
number of comets depends on the amount of material left by the
formation of the solar system, and we now know that there are relatively
large pieces," James Bauer, the lead author of the scientific paper of
the study in the Astronomical Journal, now a research professor at the
University of Maryland at College Park, Of the old material coming from the Ort cloud by a larger percentage than we thought. Noting
that during the eight-month monitoring and inspection process they
observed that the number of comets crossing the sun was three to five
times higher than expected. That
the Ort cloud is too far to be detected by current telescopes, but is
believed to be small spherical ice bodies scattered at the outer end of
the solar system, where the density of comets inside is low, so the
probability of collisions within the comets is rare, The term observed by Wise has been expelled from the Ort cloud for
millions of years. Observations were carried out during the main mission
of the spacecraft before being renamed NEOWISE and re-activated to
target near-Earth Objects (NEOs)."Our study is a rare look at the objects that have been mixed from the
Ort cloud," said Amy Mainzer, vice president of the science team,
NASA's Jet Propulsion Laboratory, the most typical example of the first
material similar to the first material from which the solar system is
formed.
Astronomers already had a larger estimate of comets from a long-term family shared in our solar system, but they did not have a good way to measure the sizes of long-range comets. This is because the comet has a nucleus surrounded by a cloud of gas and dust that appears misty in the images and obscures the comet nucleus that is known in coma (coma) but using the WISE vehicle data that shows the infrared glow of this nucleus, scientists were able to " The general comet of the comet and estimate the kernel size of these comets. The data from the 2010 WISE observations indicated that 95 of them belonged to comets of the buyer's family and 56 to long-term comets.These findings reinforce the idea that comets passing through the sun often tend to be smaller than those that spend most of their life away from the sun. Because the comets of the buyer's family exposed to heat coming from the sun for a longer period, which leads to the volatilization of substances into space, such as ice, which turns into vapor and jumps into space. According to researcher Bauer, the results of their research means that there is a difference in development between the comets of the family of Jupiter and comets Long-term. That the presence of many more long-term comets than expected means that they are the most influential on the planets including the Earth, which is responsible for the provision of ice materials from the outer limits of the solar system. The researchers also found a pool in the long-range comets orbits they studied, suggesting that there could have been larger disintegrating bodies to form these groups. The results will be important to assess the probability of comets affecting the planets of the solar system, including land.Comets travel much faster than asteroids, some of them very large, and such studies will help us determine the kind of danger that long-term comets may pose on Earth in the future.
0 Comments