8/8/2023 0 Comments Real reflection nebulaThe geological time scale (GTS) depicts the larger spans of time, from the beginning of the Earth to the present, and it chronicles some definitive events of Earth history. Over time, the Earth cooled, causing the formation of a solid crust, and allowing liquid water to exist on the surface. A giant impact collision with a planet-sized body named Theia while Earth was in its earliest stage, also known as Early Earth, is thought to have been responsible for forming the Moon. Much of the Earth was molten because of frequent collisions with other bodies which led to extreme volcanism. An immense amount of geological change has occurred in that timespan, accompanied by the emergence of life and its subsequent evolution.Įarth formed around 4.54 billion years ago by accretion from the solar nebula.Volcanic outgassing probably created the primordial atmosphere and then the ocean, but the early atmosphere contained almost no oxygen and so would not have supported known forms of life. The age of the Earth is approximately one-third of the age of the universe. Nearly all branches of natural science have contributed to the understanding of the main events of Earth's past. “The origin of this unexplained rift in the heart of NGC 1999 remains unknown.The history of Earth concerns the development of planet Earth from its formation to the present day. “However, follow-up observations using a collection of telescopes including ESA’s Herschel Space Observatory revealed that the dark patch is actually an empty region of space.” “At the time, astronomers believed that the dark patch in NGC 1999 was something called a Bok globule - a dense, cold cloud of gas, molecules, and cosmic dust that blots out background light.” “This image was created from archival WFPC2 observations that date from shortly after Servicing Mission 3A in 1999,” the researchers explained. This image of NGC 1999 is a composite of separate exposures acquired by the Wide Field Planetary Camera 2 (WFPC2) instrument onboard the NASA/ESA Hubble Space Telescope. “The most notable aspect of NGC 1999’s appearance, however, is the conspicuous hole in its center, which resembles an inky-black keyhole of cosmic proportions.” “In the case of NGC 1999, this source is the aforementioned newborn star V380 Orionis which is visible at the center of this image.” “Just like fog curling around a street lamp, reflection nebulae like NGC 1999 only shine because of the light from an embedded source.” “NGC 1999 itself is a relic of recent star formation - it is composed of detritus left over from the formation of a newborn star,” Hubble astronomers said. NGC 1999 lies near to the Orion Nebula, the closest region of massive star formation to Earth. Otherwise known as Ced 55i, DG 60 or LBN 979, the object has a diameter of 0.6 light-years. The nebula was discovered on Octoby the German-born British astronomer William Herschel. NGC 1999 is located approximately 1,350 light-years away from Earth in the constellation of Orion. Image credit: NASA / ESA / Hubble / ESO / K. The image also contains data from the OmegaCAM instrument on ESO’s VLT Survey Telescope. This Hubble image shows NGC 1999, a reflection nebula some 1,350 light-years away in the constellation of Orion.
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