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恒星密度

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With more mass than the Sun and the density of an atomic nucleus, the spinning pulsar is the collapsed core of a massive star that exploded, while the nebula is the expanding remnant of the star's outer layers.

中心的脉冲星是由大质量恒星塌缩形成的,它的质量比太阳要大而密度和原子核差不多,而星云则是由恒星外层膨胀所形成的。

Townes, who turns 94 in July, plans to continue monitoring Betelgeuse in hopes of finding a pattern in the changing diameter, and to improve the ISI's capabilities by adding a spectrometer to the interferometer.

在参宿四质量流失的过程中,其体积处于膨胀状态,密度也变得非常低,目前这颗恒星的密度仅是地球空气密度的10亿分之一。

In this phase, a star sheds some of its outer layers, eventually leaving behind a hot core that collapses to form a dense white dwarf star.

在这个阶段,恒星抛洒其外层物质,留下一个炙热的核心,并最终形成极高密度的白矮星。

On the foundation of summarizing the research findings of the Homunculus nebula, we bring forward that the sticking point to solve this question is the initial condition.

本文在综述了这些研究结果基础上,提出了解决星云形成机制的关键问题是确定初始条件,即应该先研究该恒星大爆发前星云的密度分布。

These so-called dark stars, named for the song "Dark Star" by the Grateful Dead , would contain mostly normal matter, in the form of hydrogen and helium molecules, but would be vastly larger (about 400 to 200,000 times wider) and "fluffier" than the sun and other stars.

这些所谓的暗恒星,是根据&感恩而死&乐队创作的歌曲《暗恒星》命名的。暗恒星中所包含的主要是普通物质,以氢分子和氦分子的形式而存在。但是暗恒星比太阳和其他恒星要大得多(大400倍至20万倍),密度也要低得多。

According to their simulation, gravity acted on minute density variations in matter, gases, and the mysterious "dark matter" of the universe after the Big Bang in order to form this early stage of a star -- a protostar with a mass of just one percent of our sun.

根据他们的模拟,大爆炸之后,引力对宇宙中的物质、气体和神秘的&暗物质&起作用使其分布密度产生变化,从而形成原恒星状态——形成的原恒星质量只有太阳的1%。

Firstly, we adopt the same parametersthat well fit the Milky Way disk to the M31 disk evolution. We found thatthe obtained gas surface density and star formation rate profiles do notfit the M31's observation. This demonstrates that the star formation history inthe M31 disk may totally different from that in the Milky Way disk.

首先,我们将银河系的化学演化模型应用于M31上,发现银河系的恒星形成速率与气体面密度的关系并不符合M31的观测特征,这说明两者拥有不同的恒星形成历史。

Because no light escapes after the star reaches this infinite density, it is called a black hole.

当恒星的密度达到无穷大时,因为光也逃离不了它,此时的恒星就叫做黑洞。

Since the atoms that make up normal,"solid" matter are mostly empty space, a star made almost entirely of tightly packed neutrons is extraordinarily dense: a fingernail's worth of a neutron star would have a mass of more than a trillion kilograms. A neutron star's density and gravity is second only to a black hole.

确切的说,是直径20km左右的一个超级中子,虽然不过只有一个大中型城市的体积,质量超过1.5倍太阳——译注)由原子组成的普通物质,其&实心&的物质内部其实绝大部分都是空的(大家完全可以用太阳系质量集中在太阳来想象原子内部,当然电子与行星有本质区别——译注),而一颗几乎全部由中子构成的恒星却密度极大:指甲大的一块中子星物质的质量达到万亿吨级,中子星的密度、引力仅次于黑洞。

Density ; crystal structure ; chemical bonding properties ; density of Earth's materials ; the densities of planet and fixed star

密度;晶体结构;化学键性质;地球物质的密度;行星及恒星的密度

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