Bớ LàngXóm, Bớ BanQuảnLý, Ai đã xóa bài của tôi?
         




Xin Chào Cả Nhà !


Không biết có ai bị như tui thường bị không
hay là ...
tại ...
vì cái máy của tui ...?

Dạo này cứ mỗi lần vào đây là cứ cà tưng cà giựt xuất hiện hàng chữ mắc dịch này ...

HTTP/1.1 New Session Failed...

Bị Riết làm nản lòng chiến sĩ

Hết muốn vào nữa, lúc cao hứng thì bị cụt hứng
khi chán phèo hết cảm xúc thì nó làm việc

Lỗi của ai tui hỏng biết, mong BQL xem lại dùm, mucho cám ơn.
----****----




Hôm nay 20 tháng 10 năm 2017



Kính gửi toàn thể đồng bào trong Xóm và BQL !

TT8 tui chẳng hiểu vì sao, nhà Đố của tôi đăng ở trang số 7 biến đâu mất
mà cho bài này vào thay bài Đố Vui của tui

Lại Đóng Khóa luôn nhà này

Tui nào có đăng bài này đâu nà


Mần ơn trả lại Nhà đố và những góp ý, tui biết có gào thét
thì BQL cũng vô tư im lặng


Thiệt bó tay, hết biết luôn ...






---

Forum > Ðố vui >> Scientists say there may be yet another unseen planet at solar system’s edge

Trang nhat
thanhthien8
member
ID 76839
Status:

12/14/2013


Scientists say there may be yet another unseen planet at solar system’s edge
profile - trang ca nhan posts - bai da dang email -goi thu Thong bao bai viet spam den webmaster edit -sua doi, thay doi post reply - goy y kien
Science
Scientists say there may be yet another unseen planet at solar system’s edge
Alan Boyle,GeekWire 18 hours ago
Reactions Like Reblog on Tumblr Share Tweet Email

An artist’s conception shows a hypothesized planet orbiting off the main plane of the solar system. The depicted orbits and planetary sizes are not shown to scale. (UA / LPL Illustration / Heather Roper)
Astronomers say they’ve found hints that an unseen planetary-mass object may lurk in the outer reaches of our solar system. And no, they’re not talking about Planet Nine, Planet X, Nibiru or any of the other previously hypothesized worlds out there.

Kat Volk and Renu Malhotra of the University of Arizona’s Lunar and Planetary Laboratory say their analysis points to an eight-degree tilt in the average planes of orbits for the most distant objects in the Kuiper Belt, a ring of icy mini-worlds that lie beyond the orbit of Neptune.

“The most likely explanation for our results is that there is some unseen mass,” Volk said in a news release. “According to our calculations, something as massive as Mars would be needed to cause the warp that we measured.”

In a paper to be published by the Astronomical Journal, Volk and Malhotra say the gravitational influence of a Mars-size object at a distance of 60 astronomical units, or 60 AU, could explain the orbital warp. In comparison, Earth is 1 AU from the sun, and the Kuiper Belt extends from roughly 30 to 80 AU.

The warp was detected only for objects at distances from 50 to 80 AU, which fits the model proposed in the paper.


Last year, a separate team of astronomers proposed the existence of a world they call Planet Nine, on the basis of a different type of analysis looking at distant objects with oddball orbits. That object would have to be farther out, coming no closer than about 200 AU.

Astronomers have been looking for Planet Nine ever since its existence was proposed but have not yet detected it.

Volk and Malhotra say their mystery object (Planet Ten?) may have eluded detection if it lies in the galactic plane, which is so densely packed with stars that sky surveys could easily miss it.

“The chance that we have not found such an object of the right brightness and distance simply because of the limitations of the surveys is estimated to be about 30 percent,” Volk said.

It’s also possible that the warp was caused by a different phenomenon – for example, the gravitational disruption caused by a passing star.

“That would have required an extremely close passage at about 100 AU, and the warp would be erased within 10 million years, so we don’t consider this a likely scenario,” Malhotra said.

The next best opportunity to catch a glimpse of the mystery object should come with the completion of the Large Synoptic Survey Telescope in Chile. Scheduled for first light in 2020, that instrument will take unprecedented real-time surveys of the sky, night after night.

“We expect LSST to bring the number of observed KBOs from currently about 2,000 to 40,000,” Malhotra said. “There are a lot more KBOs out there — we just have not seen them yet. Some of them are too far and dim even for LSST to spot, but because the telescope will cover the sky much more comprehensively than current surveys, it should be able to detect this object, if it’s out there.”

More from GeekWire:

Astronomers are seeing more signs of undiscovered Planet Nine’s influence
‘Planet Nine’? Astronomers boost the case for a large, unseen Planet X
Hunt for Planet Nine leads to mini-worlds
Hubble Space Telescope spots a moon circling faraway dwarf planet Makemake


Alert webmaster - Báo webmaster bài viết vi phạm nội quy