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The Kola Superdeep Borehole SG-3 (Russian: Кольская сверхглубокая скважина СГ-3, romanized: Kol'skaya sverkhglubokaya skvazhina SG-3) is the deepest human-made hole on Earth (since 1979), which attained maximum true vertical depth of 12,262 metres (40,230 ft; 7.619 mi) in 1989. [1]
The Big Hole has a surface of 17 hectares (42 acres) and is 463 metres (1,519 ft) wide. It was excavated to a depth of 240 metres (790 ft), but then partially infilled with debris reducing its depth to about 215 metres (705 ft). Since then it has accumulated about 40 metres (130 ft) of water, leaving 175 metres (574 ft) of the hole visible.
The supermassive black hole at the core of Messier 87, here shown by an image by the Event Horizon Telescope, is among the black holes in this list.. This is an ordered list of the most massive black holes so far discovered (and probable candidates), measured in units of solar masses (M ☉), approximately 2 × 10 30 kilograms.
The Great Blue Hole is a large marine sinkhole off the coast of Belize. It lies near the center of Lighthouse Reef , a small atoll 70 km (43 mi) from the mainland and Belize City . The hole is circular in shape, 318 m (1,043 ft) across and 124 m (407 ft) deep.
Sagittarius A*, abbreviated as Sgr A* (/ ˈ s æ dʒ ˈ eɪ s t ɑːr / SADGE-AY-star [3]), is the supermassive black hole [4] [5] [6] at the Galactic Center of the Milky Way.Viewed from Earth, it is located near the border of the constellations Sagittarius and Scorpius, about 5.6° south of the ecliptic, [7] visually close to the Butterfly Cluster (M6) and Lambda Scorpii.
Why 2024 Was A Big Deal For The Sun These dark areas on the Sun, as seen in satellite images, can produce space weather events known as coronal hole high-speed streams (CH HSS), which can trigger ...
Distant and early supermassive black holes, such as J0313–1806, [43] and ULAS J1342+0928, [44] are hard to explain so soon after the Big Bang. Some postulate they might come from direct collapse of dark matter with self-interaction.
These holes have been previously reported from the region, but their origin remains a mystery,” NOAA Ocean Exploration reported. “While they look almost human made, the little piles of ...