两颗绿色彗星现北方天空


两颗绿色彗星现北方天空

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两颗绿色彗星现北方天空

现在有两颗绿色彗星在天空中。 它们来自太阳系边缘,离地球很远。

彗星莱蒙将在周二靠近地球。 彗星SWAN周一靠近,然后它会变暗。

同时看到两颗彗星是很少见的。 傍晚后看北边和西南边天空。

彗星是太阳系形成时的“冰球”。 它们靠近太阳时会发热,并拖着尾巴。

彗星看起来是绿色因为它们有气体。 从地球看,它们像模糊的灰色斑点。


Questions

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现在有多少颗彗星在天空中?

现在有两颗绿色彗星在天空中。

彗星莱蒙什么时候靠近地球?

彗星莱蒙将在周二靠近地球。

彗星为什么看起来是绿色的?

彗星看起来是绿色因为它们有气体。


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两颗绿色彗星现北方天空