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What You Need to Know about the Lunar Eclipse – Moon: NASA Science – NASA Lunar Science


By Molly Wasser and Ernie Wright
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A lunar eclipse occurs when the Sun, Earth, and Moon align so that the Moon passes into Earth’s shadow. In a total lunar eclipse, the entire Moon falls within the darkest part of Earth’s shadow, called the umbra. When the Moon is within the umbra, it will turn a reddish hue. Lunar eclipses are sometimes called “Blood Moons” because of this phenomenon.
You don’t need any special equipment to observe a lunar eclipse, although binoculars or a telescope will enhance the view and the red color. A dark environment away from bright lights makes for the best viewing conditions.
The eastern half of the United States and all of South America will have the opportunity to see every stage of the lunar eclipse. Totality will be visible in much of Africa, western Europe, Central and South America, and most of North America.

NASA will feature livestreams of the eclipse from locations across the globe! We’ll also host an episode of NASA Science Live, from 11 p.m. – 12 a.m. ET. Watch at one of the following locations and ask your lunar eclipse questions using #AskNASA on social media.
Watch the Livestream here
Watch on Facebook | YouTube | NASA Television | NASA.gov/live
The Moon will be in the constellation Libra. Here are some more skywatching tips for the month of May.
The same phenomenon that makes our sky blue and our sunsets red causes the Moon to turn red during a lunar eclipse. It’s called Rayleigh scattering. Light travels in waves, and different colors of light have different physical properties. Blue light has a shorter wavelength and is scattered more easily by particles in Earth’s atmosphere than red light, which has a longer wavelength.
Red light, on the other hand, travels more directly through the atmosphere. When the Sun is overhead, we see blue light throughout the sky. But when the Sun is setting, sunlight must pass through more atmosphere and travel farther before reaching our eyes. The blue light from the Sun scatters away, and longer-wavelength red, orange, and yellow light pass through.
During a lunar eclipse, the Moon turns red because the only sunlight reaching the Moon passes through Earth’s atmosphere. The more dust or clouds in Earth’s atmosphere during the eclipse, the redder the Moon will appear. It’s as if all the world’s sunrises and sunsets are projected onto the Moon.
NASA’s mission team for the Lunar Reconnaissance Orbiter (LRO), NASA’s spacecraft in orbit around the Moon, will turn the instruments off during the eclipse. The spacecraft is solar-powered, so LRO will power down to preserve its battery while the Moon is in shadow.
The Lucy spacecraft, currently on its journey to study Jupiter’s Trojan asteroids, will turn its gaze toward its home planet to observe a portion of the five-hour long eclipse – from just before the penumbral eclipse to just before the end of totality. The mission team plans to capture a view of both the Earth and the Moon with the high-resolution imager, L’LORRI. Since the spacecraft will be 64 million miles away and uses the Deep Space Network, it will likely take a few weeks to download and process the images. Follow @NASASolarSystem for updates on the Lucy mission.
NASA Official: Lori Glaze
Producer: Molly Wasser
Content Development: Andrea Jones, Caela Barry, Tracy Vogel
Graphics: Vi Nguyen


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Sanjeev Ramachandran has found ultimate joy all through his 23-year-long journalism career by writing for national and international newspapers, websites and blogs. From technology to politics to sports to entertainment, he has been able to express ideas and pen opinion pieces on whatever triggers his interest. Currently at the helm of his own content and public relations company, called Siyahi – The Content & PR People, he makes sure that he doesn’t always let administrative tasks take over his writing space.