When a lunar eclipse happens and our lone satellite slips into Earth’s shadow, the moon becomes painted red.
Although this red is most prominent during a total lunar eclipse, moon get bright red light even during partial lunar eclipse. So why does our moon turn red and not black when bathing in Earth’s shadow?
For example, only Lunar eclipse visible in North America this year takes place on May 15 or 16, depending on your location. For some viewers, they will see a total lunar eclipse, while others will watch as the moon moves into the edge of Earth’s shadow for a partial lunar eclipse. As the moon begins to enter the central part of the Earth’s shadow, known as the umbra, that’s when the bright light comes out.
“When the moon is in the umbra, it turns slightly red. A lunar eclipse is sometimes called a ‘Blood Moon’ because of this,” NASA said.
As for why the moon looks red, it has to do with the way light is scattered. A phenomenon called Rayleigh scattering causes some wavelengths of light to be scattered more than others. In particular, the wavelengths of light that scatter the teenage particles are at most about one-tenth wavelength of light or smaller.
During a total lunar eclipse, the sun, The earth and the moon are perfectly aligned so that our Blue Planet blocks the sun’s rays from reaching the moon. Although the Earth is much larger than the sun, rays of light can still bend around the edges of our planet before being reflected on the moon. Even so, the sun’s light first passes through Earth’s atmosphere; and during that trip, particles in the atmosphere preferentially scatter blue light of shorter wavelengths. That way, longer-wavelength red and orange light would bathe the lunar surface.
Perhaps the opposite, this phenomenon also explains why the sky is blue. During the day, the sun’s light waves – made up of a band of colors that correspond to their individual wavelengths – are filtered through our atmosphere, where tiny nitrogen and oxygen gas molecules form. emits longer wavelengths like red, orange and yellow, going straight to the ground (missing our line of sight). But shorter wavelengths – such as violets and blues – are absorbed and then scattered in all directions, giving them more of a chance to hit our eyes.
The moon will change different shades during different phases of a total lunar eclipse, turning from its initial gray to orange and amber hues. Atmospheric conditions can also affect the brightness of colors. For example, excess particles in the atmosphere, such as ash from a large wildfire or a recent volcanic eruption, can give the moon a darker red color, according to NASA.
The Moon does not always hide completely behind the Earth’s shadow. During partial lunar eclipses, the sun, Earth, and moon are slightly out of alignment, and so our planet’s shadow only partially engulfs the moon.
A novice skywatcher might not even notice the third type of lunar eclipse, the horizontal type, in which the moon lies within the Earth’s depression, or its outer shadow.
The next two total lunar eclipses will occur on May 16, 2022 (visible in the Americas, Europe and Africa), followed by one on November 8, 2022 (visible in found in Asia, Australia, the Pacific and the Americas), according to NASA.
Original article on Live Science.
https://www.livescience.com/33627-moon-red-orange-lunar-eclipse.html Why does the moon turn red during a total lunar eclipse?