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Details. Earth is the third planet from the Sun with an approximate distance of 149.6 million kilometres (93.0 million miles), and is traveling nearly 2.1 million kilometres per hour (1.3 million miles per hour) through outer space. [ 11]
Orion Arm. The Orion Arm, also known as the Orion–Cygnus Arm, is a minor spiral arm within the Milky Way Galaxy spanning 3,500 light-years (1,100 parsecs) in width and extending roughly 20,000 light-years (6,100 parsecs) in length. [ 2] This galactic structure encompasses the Solar System, including Earth.
NGC 1300 is a spiral galaxy with a pronounced bar. Spiral arms [ 1] are a defining feature of the structural composition of spiral galaxies, which are situated within discs and exhibit heightened brightness relative to their surrounding environment. [ 2] Such structures take the form of spirals, which in unbarred galaxies usually originate from ...
Density wave theory or the Lin–Shu density wave theory is a theory proposed by C.C. Lin and Frank Shu in the mid-1960s to explain the spiral arm structure of spiral galaxies. [1] [2] The Lin–Shu theory introduces the idea of long-lived quasistatic spiral structure (QSSS hypothesis). [1] In this hypothesis, the spiral pattern rotates with a ...
As stars move through an arm, the space velocity of each stellar system is modified by the gravitational force of the local higher density. Also the newly created stars do not remain forever fixed in the position within the spiral arms, where the average space velocity returns to normal after the stars depart on the other side of the arm. [26]
The geologic time scale is a way of representing deep time based on events that have occurred throughout Earth's history, a time span of about 4.54 ± 0.05 Ga (4.54 billion years). [ 5] It chronologically organises strata, and subsequently time, by observing fundamental changes in stratigraphy that correspond to major geological or ...
Near 3 kpc Arm. Artist's conception of the spiral structure of the Milky Way with two major stellar arms and a central bar. In this image the Near 3 kpc Arm is located near the center, below and to the right of the bulge. The Near 3 kpc Arm (formerly also called Expanding 3 kpc Arm or simply 3 kpc Arm) was discovered in the 1950s by astronomer ...
Earth's rotation. Earth's rotation or Earth's spin is the rotation of planet Earth around its own axis, as well as changes in the orientation of the rotation axis in space. Earth rotates eastward, in prograde motion. As viewed from the northern polar star Polaris, Earth turns counterclockwise . The North Pole, also known as the Geographic North ...