NASAのインスタグラム(nasagoddard) - 10月29日 03時39分

Werewolves beware! Tonight, there is a full Moon! 🌕

Folklore aside, why do we see Moon phases?

The Moon is always half-lit by the Sun (except during a lunar eclipse). The side of the Moon facing the Sun appears bright because of reflected sunlight, and the side of the Moon facing away from the Sun is dark. Our perspective on the half-lit Moon changes as the Moon orbits Earth. When the side nearest to us is fully lit, we call this a full Moon. When the far side is fully lit and the near side is dark, we call this a new Moon. When we see other phases, we are looking at the division between lunar night (the dark part) and day (the bright part).

Image description: A full Moon is pictured from the @国際宇宙ステーション. The Moon lingers to the left of the image, with a horizon of Earth’s blue glow splitting the image nearly in half, blending into the black of space.

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