A phenomenon where we can see a long tail in the sky. What is it? A. Comet B. Meteor C. Asteroid 相关知识点: 试题来源: 解析 A。这是彗星现象,彗星有长尾巴。选项 B 流星瞬间出现一道条纹。选项 C 小行星通常没有长尾巴。反馈 收藏 ...
an anti-tail is formed from fresh dust blown back from the comet’s head by the pressure of sunlight. As the comet continues along its orbital path, last week’s dust lingers behind, forming a “trail of breadcrumbs” in its wake. Right now those ...
Unidentified interstellar visitor 'Oumuamua might be a comet that lost its tail after being hit by the sun's cosmic rays.
~20 copies of the envelope (E) protein, and ~100 copies of the spike (S) protein (Fig.1). The M protein has a molecular weight of 25–30 kDa, and it forms a dimer