The BBC takes a look at what could be causing the issue. Any large hole that opens up in the ground tends to be referred to as a sinkhole, but strictly speaking this catch-all term is inaccurate.
A large crater in Siberia is getting bigger due to the way permafrost interacts with the environment. It is helping scientists understand more about past climates and how the permafrost is ...
National Parks and Wildlife Services (NPWS) ranger Duncan Allen describes it as "just a big hole in the ground", but says there are many legendary stories involving the Big Hole. "I'd love to go down.
The 25 ground-based and orbiting telescopes ... Supermassive black holes are thought to exist at the center of all large galaxies, including our own, the Milky Way. M87* stands out from the ...