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.

另外的關于2 GeV以上能譜變軟的可能解釋是高能光子和寄主活動星系核的軟X射線輻射場通過電子對產(chǎn)生反應而被吸收国产亚洲日韩欧美一区，但是這個解釋要求反應區(qū)域要很靠近中心黑洞(1~100倍引力半徑)，這和3C 454.3的X射線測量譜相矛盾。

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)部很慢的演化啪啪啪色免费网站，因為一個星系總會有一些引力不穩(wěn)定，如上圖中的NGC1300黄色网站免费a，它是一個棒旋星系淫插视频一区二区三区，這種bar結構導致的引力不完全對稱會驅(qū)使很多氣體和塵埃損失角動量往里面落，我們可以清楚的看到dust lanes九九手机在线视频，有點像黑洞的吸積美女污视频免费在线观看，但這個星系是個非活動星系，目前還沒有黑洞存在的明確證據(jù)欧美性荡视频，but我相信肯定是有的亚洲精品国产专区91在线，沒有比在星系中心放一個黑洞再完美不過的事情了，或許這些下落的dust lanes是黑洞發(fā)光的開始呢日韩在线视频台湾。

What is the center of gravity?

地球引力的中心是什么国产性交一级？

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

挑戰(zhàn)是強迫我們尋找新的引力中心的禮物。

"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爱搞网，這在地球引力作用于任何三維身體上是非常重要的一點美女男人久久网站。"

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.

對于一個離中心為 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明星黄色视频在线，來自軌道外的恒星的引力合力為零在线激情A片。

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，"Mitchell說91做a免费视频，"是圍繞一個中心繞圈轉(zhuǎn)動免费黄片子，所以在圈的每一個點上的引力是不同的。

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柚木在线无码视频精品。

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)僅通過引力進行相互作用，所以其呆在聲波的中心日韩视频05，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動定律與他的引力理論間的一致性，展示了地面物體與天體的運動都遵循著相同的自然定律91精品国产色综合久久；為太陽中心說提供了強有力的理論支持国产使劲cao视频，并推動了科學革命。