Alternatively, the spectral softening above 2 GeV could be due to gamma-ray absorption via photon-photon pair production on the soft X-ray photon field of the host active galactic nucleus, but such an interpretation would require the dissipation region to be located very close (l~100 gravitational radii) to the black hole, which would be inconsistent with the X-ray spectrum of the source.

另外的關(guān)于2 GeV以上能譜變軟的可能解釋是高能光子和寄主活動(dòng)星系核的軟X射線輻射場(chǎng)通過電子對(duì)產(chǎn)生反應(yīng)而被吸收自拍偷拍欧美精品，但是這個(gè)解釋要求反應(yīng)區(qū)域要很靠近中心黑洞(1~100倍引力半徑)91麻豆精品婷婷五月，這和3C 454.3的X射線測(cè)量譜相矛盾亚洲无线码成人AV。

In the core of the larger spiral structure of NGC 1300, the nucleus shows its own extraordinary and distinct "grand-design" spiral structure that is about 3,300 light-years long. Only galaxies with large-scale bars appear to have these grand-design inner disks — a spiral within a spiral. Models suggest that the gas in a bar can be funneled inwards, and then spiral into the center through the grand-design disk, where it can potentially fuel a central black holes. NGC 1300 is not known to have an active nucleus, however, indicating either that there is no black hole, or that it is not accreting matter.

星系演化除了像兩個(gè)星系相撞那樣的劇烈作用之外，還有自己內(nèi)部很慢的演化男人的天堂在线无码视频网站，因?yàn)橐粋€(gè)星系總會(huì)有一些引力不穩(wěn)定欧美巨，如上圖中的NGC1300，它是一個(gè)棒旋星系97亚洲色图，這種bar結(jié)構(gòu)導(dǎo)致的引力不完全對(duì)稱會(huì)驅(qū)使很多氣體和塵埃損失角動(dòng)量往里面落国产精品国产三级囯快看，我們可以清楚的看到dust lanes，有點(diǎn)像黑洞的吸積无码黄色视频大全，但這個(gè)星系是個(gè)非活動(dòng)星系A片在线视频观看，目前還沒有黑洞存在的明確證據(jù)，but我相信肯定是有的亚洲中文字幕无码乱线，沒有比在星系中心放一個(gè)黑洞再完美不過的事情了超碰在线看，或許這些下落的dust lanes是黑洞發(fā)光的開始呢。

What is the center of gravity?

地球引力的中心是什么日韩精品片第7页在线观看视频？

Challenges are gifts that force us to search for a new center of gravity.

挑戰(zhàn)是強(qiáng)迫我們尋找新的引力中心的禮物美女裸体黄网站18禁止免费。

"This changes the mother's center of mass, which is a critical point in any three-dimensional body on which gravity acts."

"這改變了母親的身體中心，這在地球引力作用于任何三維身體上是非常重要的一點(diǎn)性小说在线视频。"

The total gravity force on the star from the stars enclosed by its circular orbit can be treated as if they are concentrated at the center.

對(duì)于一個(gè)離中心為 r 的恒星來講，來自軌道內(nèi)的恒星的引力與把它們集中在星系中心的一樣，來自軌道外的恒星的引力合力為零麻豆精品视频在线免费观看。

Enceladus' orbit around Saturn is eccentric," Mitchell says. It's just enough off of circular that the effect of gravity on the moon is different from one point to another, and different from the planet's other moons."

Enceladus的公轉(zhuǎn)軌道是離心圓超碰在线黄色网，"Mitchell說，"是圍繞一個(gè)中心繞圈轉(zhuǎn)動(dòng)欧美日劲，所以在圈的每一個(gè)點(diǎn)上的引力是不同的国产美女羞羞网站在线观看。

All objects are pulled towards the centre of the Earth by the force of gravity.

所有的物體都由于引力而拉向地球中心。

The dark matter only interacts gravitationally and so it stays at the center of the sound wave, the origin of the overdensity.

暗物質(zhì)僅通過引力進(jìn)行相互作用日韩口爆，所以其呆在聲波的中心欧美性爱在线免费观看视频，也即聲波起源的高密度區(qū)域。

Newton showed that the motions of objects on Earth and of celestial bodies are governed by the same set of natural laws by demonstrating the consistency between Kepler's laws of planetary motion and his theory of gravitation, thus removing the last doubts about heliocentrism and advancing the scientific revolution.

他通過論證開普勒行星運(yùn)動(dòng)定律與他的引力理論間的一致性谁有免费黄色网站直接看的，展示了地面物體與天體的運(yùn)動(dòng)都遵循著相同的自然定律网站涩涩；為太陽中心說提供了強(qiáng)有力的理論支持，并推動(dòng)了科學(xué)革命欧美色综合网站在线看。

barycenter：引力中心;質(zhì)量中心

巴林杰隕石坑 Barringer crater | 引力中心;質(zhì)量中心 barycenter | 質(zhì)心坐標(biāo) barycentric coordinates

center of attraction：引力中心

center lubrication 集中潤滑 | center of attraction 引力中心 | center of buoyancy 浮力中心

center of magnus force：磁扭力中心

引力中心 center of gravity | 磁扭力中心 center of magnus force | 壓力中心 center of pressure

central force：有心力

可以證明1.行星受太陽引力作用,這個(gè)力始終指向太陽中心,此為有心力(central force)作用于行星,此力對(duì)太陽中心的力矩為零. 因此行星對(duì)太陽中心參考點(diǎn)的角動(dòng)量守恒:r× mv=恒矢量L(r 為太陽中心到行星的矢徑,

ecliptic plane：黃道面

黃道面(ecliptic plane)是指地球繞太陽公轉(zhuǎn)的軌道平面,與地球赤道面交角為23°27'. 由于月球和其它行星等天體的引力影響地球的公轉(zhuǎn)運(yùn)動(dòng),黃道面在空間的位置總是在不規(guī)則地連續(xù)變化. 但在變動(dòng)中,任一時(shí)間這個(gè)平面總是通過太陽中心.

physical libration：物理天平動(dòng)

(A)物理天平動(dòng)(physical libration). 上文所說,由月球中心到月臉中心的半徑,大于由月球中心到月背中心,結(jié)果導(dǎo)致地對(duì)月的引力作用不平衡,使月球自轉(zhuǎn)的速度不一律而出現(xiàn)擺動(dòng).

pole：極

人們通常用"極"(pole)來說明世界力量中心及其在世界經(jīng)濟(jì)格局中的地位和突出作用.能夠作為"極"的國家必須是實(shí)力極,增長極,引力極和輻射極.

topography：分子構(gòu)圖

2.乙酰膽堿與受體的結(jié)合方式:膽堿能受體的分子構(gòu)圖(topography)與AchE有相似之處,但又不完全相同. 如M受體有兩個(gè)活性中心(負(fù)性部位、親酯部位)和疏水區(qū). 當(dāng)Ach與受體接近時(shí)發(fā)生①Ach的季銨氮與受體分子的負(fù)性部位以靜電引力和范德華引力相互結(jié)合;

attractile：具有吸引力的, 引人注意的

attractant | (對(duì)昆蟲等動(dòng)物具有誘惑力的)引誘劑, 引誘物 | attractile | 具有吸引力的, 引人注意的 | attracting centre | 引力中心

center of buoyancy：浮[力中]心

center of attraction 引力中心 | center of buoyancy 浮力中心 | center of curvature 曲率中心