In the process of the collision with the interstellar matter in the orbit around the sun,Venus and Mercury gain the re.
本文在行星物质共同形成学说基础上,假定太阳系形成初期,所有大行星都一样顺向自转,在与公转轨道上星际物质碰撞过程中,因物质密度的不均匀分布使金星和水星获得了反向的角动量,形成了现在的自转状态。
microscopic particles in the interplanetary medium.
行星际物质中极小的颗粒。
Characteristics of the Propagation and Evolution of Interplanetary Coronal Mass Ejections in the Heliosphere;
行星际日冕物质抛射在行星际空间的传播和演化规律
Stars condense from the matter scattered thinly through interstellar space.
恒星是疏散在星际空间的物质凝聚而成的。
planetary and interplanetary probe
行星和行星际探测器
There is also dark matter - the material between the stars and planets.
其实还有黑洞??一种介于恒星与行星间的物质。
International Interplanetary Space Travel Research Association
国际星际航行研究协会
Tiny pieces of substance were spun off by the sun to form the planets.
小块物质被太阳抛出来，形成了行星。
A star is formed when a cloud of gas collapses from the interstellar medium toward high density.
一个气体云自星际物质中坍缩，密度达到很高时，即形成了一个恒星。
Molecular clouds play an integral role in the prestellar evolutionary sequence of interstellar matter.
分子云在星际物质的星前期演化序列中起着不可缺少的作用。
It also means that the comet is not made of small, pristine interstellar materials either.
这同样也表示彗星不是由少量、原始星际物质构成的。
theory of the motion of interplanetary vehicle
行星际飞行器运动理论
We observe in the galaxy much larger, denser, and more massive aggregates of cold interstellar matter.
在银河系中还观测到大小，密度和质量都要大得多的冷星际物质团。
International Code of Conduct for Plant Gerplasm Collecting and Transfer
国际收集和转移植物种质行为守则
In both cases, the attractive gravity of a satellite appears to repulse ring material.
无论如何，卫星的引力竟好似在推开行星环中的物质。
an interplanetary journey in a space ship
乘太空船作星际旅行
Together, these particles form that most diffuse and insubstantial of substances-- interstellar dust.
聚集在一起，这些微粒形成了大多数弥漫、弱的物质——星际尘埃。
An increase in the mass of a celestial object by the collection of surrounding interstellar gases and objects by gravity.
吸积，天体增大因重力吸引星际间的物质而引起天体的增大
These filaments reveal where the shock wave is encountering lower-density, more uniform interstellar material.
纤维揭示的是激波与更均匀的低密度星际物质相遇的地方。