The hole is the entrance to an underground cavern.
The volcano—located around 85 miles south of Ecuador's capital in the Andes mountains—has been frequently active since 1999.
New research adds more weight to the theory that the asteroid caused dinosaur extinction.
The volcano is infamous for a catastrophic eruption in 79 A.D. that destroyed the Roman settlements of Pompeii, Herculaneum, Oplontis and Stabiae.
Volcano experts say the danger of another eruption remains high, with more than 100 tremors reported since Wednesday.
Scientists have uncovered a geological explanation for why some volcanic eruptions are more explosive than others.
The bubbles are the result of magma being rapidly cooled by water as it shoots out of underwater vents.
Scientists from the Deep Carbon Observatory have provided results from a decade-long study into the world's carbon reservoirs.
Loki Patera is located on Jupiter's moon Io, one of the most volcanically active places in the solar system.
The region has experienced an average of 30 earthquakes per hour following Friday night's swarm.
The volcano—located in the North Pacific—has long been dormant, with its last eruption occurring in 1924.
Growing evidence suggests that the extinction of the dinosaurs involved profound, complex and interconnected changes to the global systems that support life. Much like we are facing today.
Anak Krakatau is notable for being the currently active part of the famous volcanic island Krakatau—which experienced a cataclysmic eruption in 1883.
Researchers say the hatching "eggs" are the first of their kind in the world.
The eruption may have wiped out the ozone layer.
See the coastline of Hawaii before and after the Kilauea volcano added acres and acres of lava land.
The formation was likely formed as a result of a series of explosive volcanic eruptions more than 3 billion years ago.