what is the causes of lunar eclipse ?
A lunar eclipse occurs when the Earth passes between the Sun and the Moon, causing the Earth's shadow to be cast upon the Moon. This happens during a full moon when the Sun, Earth, and Moon are aligned in a straight line. The Earth's shadow has two parts: the penumbra (outer shadow) and the umbra (inner shadow). When the Moon passes through the Earth's penumbral shadow, a penumbral lunar eclipse occurs, which is subtle and often hard to notice. When the Moon passes through the Earth's umbral shadow, a partial or total lunar eclipse occurs, depending on how much of the Moon is covered by the Earth's shadow. The reddish color of the Moon during a total lunar eclipse is due to the Earth's atmosphere scattering and refracting sunlight, allowing only the longer-wavelength red and orange light to reach the Moon.
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