Orange moonlight streaks across the evening sky as the Super Blue Moon rises behind a windmill in Sesimbra, Portugal, on Jan. 31, 2018.
The moon's phases are caused by changes in the amount of illumination from the moon that is visible from the Earth's surface as the moon orbits our planet each month. There are eight distinct phases every month, four of them occurring roughly a week apart. They are: the New Moon; Waxng Crescent; First Quarter (or half-full; Waxing Gibbous; Full Moon; Waning Gibbous; Last Quarter (half-full on other side); Waning Crescent. You can read definitions for these moon phases here. When the moon is full and at its closest point to the Earth in it's orbit, it is known as a "Supermoon." Lunar eclipses occur during full moons, when the moon passes through all or part of Earth's shadow. During New Moons, the moon can cover part or all of the sun's disk, creating a solar eclipse. Learn more about the moon's phases here.
Related Topics: The Moon
A spectacular photo shows the International Space Station (ISS) crossing the face of the moon in the lead-up to the long-awaited "Super Blue Blood Moon" eclipse.
A blue moon, a supermoon, and a blood moon (i.e. a lunar eclipse) are happening around the same time in January 2018: Here’s when.
The second full moon of January passed through Earth's shadow in a Super Blue Blood Moon eclipse today (Jan. 31), a rare lunar sight visible to millions of observers around the world.
See the first photos of the Super Blue Blood Moon of 2018 as they come in from across the U.S. on Twitter, Instagram and the web.
Today (Jan. 31), a Blue Moon, supermoon and blood moon coincide to create a rare lunar event not seen in North America in more than 150 years.
Celebrate this week's Super Blue Blood Moon — which includes a total lunar eclipse — with some moony cocktails.
Observing next week's total lunar eclipse might be challenging for some skywatchers in North America. Here's all the info on how and when to see it, based on your location.
The Super Blue Blood Moon will be a treat for skywatchers, and this rare celestial event on January 31 will give scientists a chance to learn more about moon dust, like how "fluffy" it is.
Skywatchers in Alaska, the Hawaiian islands and the western part of North America will have the best view of the rare "Super Blue Blood Moon" in the early morning of Jan. 31.
A nearly full "supermoon" rises above a pink band in the sky known as the "Belt of Venus" in this photo captured above Lake Alqueva in the Portuguese village of Monsaraz.
If you live in Hawaii, Alaska or the western half of North America, be sure to put a big circle on your calendar for Jan. 31, when you will have an opportunity to see the second full moon of January.
One day after the new moon disappeared in the night sky on Dec. 18, the face of the slender, crescent moon was only 2 percent illuminated by sunlight.
The annual Quadrantid meteor shower peaks today (Jan. 3), but don't get your hopes up for a spectacular sky show.
The biggest full moon of 2018 lit up the night sky overnight on Jan. 1 and 2, thrilling skywatchers around the world. See amazing photos of the New Year's Day supermoon Wolf Moon by readers here!
Skywatchers got a glimpse of a spectacular full moon this New Year's Day — the largest the moon will appear in 2018.