Longest lunar eclipse of the 21st century
The moon is seen during a lunar eclipse over Shanghai, China July 28, 2018.
Observers across much of the world turned their eyes skyward Friday to watch a complete lunar eclipse.
Singapore
An astronomy enthusiast looks through a pair of binoculars to see the lunar eclipse of a blood moon at Marina South Pier in Singapore July 28, 2018.
Greece
A full moon rises behind the Temple of Poseidon in Cape Sounion near Athens, Greece, before the start of a lunar eclipse, July 27, 2018.
Cairo
The "blood moon" rises during a lunar eclipse over Cairo, Egypt July 27, 2018.
The event was referred to as a "blood moon" because the moon will turn a deep red due to the refraction of light in Earth's atmosphere during the eclipse.
Cairo
A general view during a lunar eclipse over Cairo, Egypt, July 27, 2018.
Cairo
A view of the lunar eclipse over Cairo, Egypt, July 27, 2018.
The eclipse was visible in Australia, Africa, Asia, Europe and South America when the sun, Earth and moon lined up perfectly, casting Earth's shadow onto the moon.
Nairobi
The moon is seen during a lunar eclipse over Nairobi, Kenya, July 27, 2018.
Cairo
A view of the lunar eclipse over Cairo, Egypt, July 27, 2018.
The eclipse lasting close to four hours, with totality lasting 1 hour and 43 minutes, is the longest lunar eclipse of the 21st century.
Cairo
A "blood moon" rises during a lunar eclipse over Cairo, Egypt July 27, 2018.
Singapore
Astronomy enthusiasts watch the lunar eclipse at Marina South Pier in Singapore, July 28, 2018.
Zenica
A full moon rises during an eclipse in Zenica, Bosnia and Herzegovina, July 27, 2018.
Ankara
A blood moon rises over Turkish capital Ankara, Turkey, late Friday, July 27, 2018.
Kenya-Tanzania
A lunar eclipse of a full "blood moon" rises near the Oloitoktok town along the Kenya-Tanzania border, July 27, 2018.
Berlin
A lunar eclipse is seen above the cityscape and the television tower in Berlin, Germany, July 27, 2018.
Berlin
A lunar eclipse is seen through clouds in Berlin, Germany, July 27, 2018.
Minsk
A full moon rises behind a house on the outskirts of Minsk, Belarus, during an eclipse on July 27, 2018.
Chardonne
The full moon rises above the Tour de Mayen and Tour d'Ai in the Swiss Alps in this picture taken during the lunar eclipse, in Chardonne near Vevey, Switzerland, July 27, 2018.
Germany
A "blood moon" is seen during a full lunar eclipse in the southern Bavarian village of Raisting, near Munich, Germany, July 27, 2018.
Egypt
Mars also put in an appearance in the vicinity of the "blood moon," as seen during a lunar eclipse at the desert of Al Fayoum Governorate, southwest of Cairo, July 27, 2018.
Indonesia
Residents look at Mars alongside the lunar eclipse in Padang, Sumatra island, Indonesia, July 28, 2018.
Frankfurt
A blood moon is seen in the sky over Frankfurt, Germany, July 27, 2018.
Israel
A full moon rises, as seen from the city of Ashkelon, Israel, July 27, 2018.
Jordan
The moon is seen during a lunar eclipse over the Coptic Orthodox Patriarchate Church in Amman, Jordan, July 27, 2018.
Rio de Janeiro
The moon is seen during the longest lunar eclipse of the 21st century, in Rio de Janeiro, Brazil, July 27, 2018.
Brasilia
A couple poses for photo during a total lunar eclipse in Brasilia, Brazil, July 27, 2018.
Sri Lanka
A full lunar eclipse is seen in Dambulla, Sri Lanka July 28, 2018.