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備註請放最後面 違者新聞文章刪除

1.媒體來源:

外媒    phys.org

2.記者署名:

Mark Thompson, Universe Today

3.完整新聞標題:

Is this the first hint of Planet Nine?

首次偵測到第九行星的天文信號？

4.完整新聞內文:

Is this the first hint of Planet Nine?

by Mark Thompson, Universe Today

首次偵測到第九行星的天文信號？

作者：馬克湯普森， 《今日宇宙》

Artistic impression of the proposed Planet Nine in distant orbit of the sun.
Credit: Tom Ruen

第九行星在遙遠的太陽軌道上的藝術印象圖。圖片來源：Tom Ruen

The solar system consists of our star, the sun, and everything bound to it by
gravity: the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus,
and Neptune, along with dwarf planets like Pluto, dozens of moons, and
millions of asteroids and comets. The planets orbit the sun in elliptical
paths, with the inner four being rocky terrestrial worlds and the outer four
being gas and ice giants many times larger than Earth.

太陽係由我們的恆星—太陽以及所有受引力束縛的天體組成：水星、金星、地球、火星


Our fascination with hunting down more planets in the solar system has until
now not revealed any strong candidates. With Pluto having been classed as the
ninth planet for many years, the hunt was on for Planet X. With the demotion
of Pluto in 2006, the idea of Planet Nine was first proposed in 2016 by
astronomers Batygin and Brown. Its existence is inferred from the unusual
orbital clustering of several trans-Neptunian objects, suggesting they're
being influenced by a large, unseen planetary body. Despite extensive
searches using powerful telescopes, Planet Nine has remained theoretical as
direct observation has proven elusive.



In a study led by Terry Long Phan posted to the arXiv preprint server, the
team searches for Planet Nine candidates by using two far-infrared all-sky
surveys, IRAS and AKARI, whose 23-year separation allows detection of Planet
Nine's expected orbital motion (~3′/year). The search uses the AKARI
Far-Infrared Monthly Unconfirmed Source List (AKARI-MUSL), which is better
suited for identifying faint, moving objects than the standard AKARI Bright
Source Catalogue.



Researchers estimated Planet Nine's expected flux and motion based on assumed
mass, distance and temperature, then applied positional and flux criteria to
match sources between IRAS and AKARI. They identified 13 candidate pairs with
angular separations corresponding to heliocentric distances of 500–700 AU
and masses of seven to 17 Earth masses.



After a rigorous analysis and selection process, including visual inspection
of images, the team identified one strong candidate pair, where the IRAS and
AKARI sources showed the expected angular separation (42′–69.6′) and were
not detected at the same position in each survey. The AKARI detection
probability map confirmed the candidate's consistency with a slow-moving
object, showing two detections on one date and none six months earlier.



However, IRAS and AKARI data alone are insufficient to determine a precise
orbit so there will need to be follow-up observations to confirm the
candidate and fully determine its orbit using DECam, which can detect faint
moving objects within about an hour of exposure, aiding in understanding the
solar system's evolution and structure.



The search for Planet Nine continues to push the boundaries of astronomical
discovery using advanced survey techniques and pairing it with careful
analysis. While the identification of a promising candidate is an exciting
step forward, confirmation will require further observations and continued
collaboration across the astronomical community. If Planet Nine is ultimately
detected, it would mark a monumental addition to our understanding of the
solar system.


and AKARI Data, arXiv (2025). DOI: 10.48550/arxiv.2504.17288

Journal information: arXiv

Provided by Universe Today

更多資訊： Terry Long Phan 等人，使用 IRAS 和 AKARI 數據尋找第九大行星，arXiv
(2025)。DOI：10.48550/arxiv.2504.17288

期刊資訊： arXiv

由Universe Today 提供

5.完整新聞連結 (或短網址)不可用YAHOO、LINE、MSN等轉載媒體:

https://phys.org/news/2025-04-hint-planet.html

6.備註:

13組數據跑出來，真的中了一組。恭喜。就算只有最低質量7倍地球大，
撕開地表也算不上什麼難事。

半年以前不存在於該宙域嗎...

速度好像有點快誒？怕.jpg



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※ 作者: STAV72 2025-05-01 15:24:55
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