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SMSS J215728.21-360215.1, commonly known as J2157-3602, is one of the fastest growing black holes and one of the most powerful quasars known to exist as of 2021.The quasar is located at redshift 4.75, [1] corresponding to a comoving distance of 2.5 × 10 10 ly from Earth and to a light-travel distance of 1.25 × 10 10 ly.
Ton 618 (this quasar has possibly the biggest black hole ever found, estimated at 66 billion solar masses) [1] 3C 371; 4C +37.11 (this radio galaxy is believed to have binary supermassive black holes) [2] AP Lib; S5 0014+81 (said to be a compact hyperluminous quasar, estimated at 40 billion solar masses) [3]
Big Basin Prairie Preserve – St. Jacob's Well, Kansas, a water-filled sinkhole which lies in the Little Basin, and the Big Basin, a 1.5-kilometre-wide (1 mi) crater-like depression; Blue Hole (Castalia) – a fresh water pond located in Castalia, Erie County, Ohio; Blue Hole (New Mexico) – circular, bell-shaped pool east of Santa Rosa, New ...
Scientists using an ocean drilling vessel have dug the deepest hole ever in rock from Earth's mantle - penetrating 4,160 feet (1,268 meters) below the Atlantic seabed - and obtained a large sample ...
Although the majority of the site contained village house features, a number of unusually shaped large post holes were also discovered. The post holes were 7 feet (2 m) in length and 2 feet (60 cm) in width and formed sloping ramps to accommodate the insertion and raising of the estimated 20 feet (6 m) tall posts to a 4 feet (1 m) depth into ...
This idle period may have contributed to a breakdown after drilling resumed; on 27 September 1984, after drilling to 12,066 metres (39,587 ft), a 5-kilometre (3.1 mi) section of the drill string twisted off and was left in the hole. Drilling was restarted in September 1986, 7,000 metres (23,000 ft) from the first hole.
However, in 1760, a picture of Percé Rock drawn by an English officer, Captain Hervey Smyth, showed two arches, one of which collapsed in June 1845. [4] Percé rock's two large holes were cut through by the sea waves. One of the holes seen now is an arch described as "gothic arch of rock", which is about 15 metres (49 ft) high.
[1] [4] [5] In September 2018, a team led by geologist Catherine Hickson and archaeological surveyor John Pollack returned to the site and made a partial descent into the cave once it was snow-free, estimating it to be at least two kilometres (1.2 mi) long. [1] [3] [4] [5] The ground reconnaissance expedition estimated the physical dimensions ...