хелиум

хелиум

An element with atomic number 2; symbol: He. It is the second most common element in the Sun and outer planets, but rare on the rocky planets.

0 0

完善词条

添加图像

词性：名词
同义词：
词汇：
行业/领域：天文学
类别行星科学
Company: PSRD
产品：
取首字母的缩写词：

添加至 My Glossary

其他语言：

类似词条

метеорит

天文学; 行星科学

A natural solid object (metallic or stony/silicate) larger than 10 µm (microns) that has traveled through space, by natural means from the celestial body on which it formed, and ...

кратер

天文学; 行星科学

A hole or depression. Most are roughly circular or oval in outline. On Earth most natural craters are of volcanic origin. On the Moon most are of impact origin.

магматски океан

天文学; 行星科学

Term used to describe the layer of magma, hundreds of kilometers thick; thought to have covered the Moon 4. 5 billion years ago. The timing, duration, cooling rates, convection, ...

негравитациони сили

天文学; 行星科学

Forces that alter the path of a comet, which are not caused by gravitational interaction with the Sun and planets. Typically this refers to uneven outgassing from vents on the ...