امتیاز موضوع:
  • 31 رأی - میانگین امتیازات: 2.77
  • 1
  • 2
  • 3
  • 4
  • 5
نظریه ی جدید در مورد شکل گیری ماه !
#1
[تصویر:  13516797711.jpg]







New research, funded by the NASA Lunar Science Institute (NLSI),
theorizes that our early Earth and moon were both created together in a
giant collision of two planetary bodies that were each five times the
size of Mars.



This new theory about how Earth’s moon formed is challenging the
commonly believed “giant impact hypothesis,” which suggests that Earth's
moon formed from a colossal impact of a hypothetical planetary embryo,
named Theia, with Earth, early in our Solar System's history.



“Our understanding of the solar system is constantly being refined with
each new discovery. This research illustrates the importance of modeling
planetary formation to enhance our scientific understanding of the moon
and its place in the solar system,” said NLSI Deputy Director Greg
Schmidt.



The giant impact hypothesis has been a widely accepted theory for how
the Earth-moon system formed. In the giant impact scenario, the moon
forms from debris ejected into an Earth-orbiting disk by the collision
of a smaller proto-planet with the early Earth. One of the challenges to
the longstanding theory of the collision, is that a Mars-sized
impacting body, whose composition likely would have differed
substantially from that of Earth, likely would have left Earth and the
moon with different chemical compositions, which they are not.



After colliding, the two similar-sized bodies then re-collided, forming
an early Earth surrounded by a disk of material that combined to form
the moon. The re-collision and subsequent merger left the two bodies
with the similar chemical compositions seen today.



The new model was developed by Robin M. Canup of the Southwest Research
Institute (SwRI), San Antonio, Texas. Canup’s research was motivated by
accompanying studies by other scientists on the early dynamical history
of the moon, and accounts for this similarity in composition, while
also yielding an appropriate mass for Earth and the moon.



“The ultimate likelihood of each impact scenario will need to be
assessed by improved models of terrestrial planet formation,” Canup
said.



The paper, “Forming a Moon with an Earth-like composition via a Giant
Impact,” by R.M Canup, was published recently in the journal Science
online, at the Science Express website. The results were also presented
October 15th at the 44th Meeting of the AAS Division for Planetary
Sciences in Reno, Nev.




Karen Jenvey
Ames Research Center, Moffett Field, Calif.


در مورد اظهار نظر آقایون در تاپیک دلخوری باید بگم:
آقایون: کم گوی و گزیده گوی چون در// تا ز اندک تو جهان شود پر!!!
هرچند ک کلام گوهر بار از زبان شما جاری نشده، نمیشود و نخواهد شد!!!
پاسخ
 سپاس شده توسط Hamid Jafary Pooya ، crux


پرش به انجمن:


کاربرانِ درحال بازدید از این موضوع: 1 مهمان