galactic$30671$ - ορισμός. Τι είναι το galactic$30671$
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Τι (ποιος) είναι galactic$30671$ - ορισμός

UNIT OF TIME
Galactic time; Galactic Year; Galactic orbit; Galactic Orbit; Galactic years
  • The orientation of the Solar System's motion

Galactic plane         
PLANE ON WHICH THE MAJORITY OF A DISK-SHAPED GALAXY'S MASS LIES
Galactic Plane
The galactic plane is the plane on which the majority of a disk-shaped galaxy's mass lies. The directions perpendicular to the galactic plane point to the galactic poles.
Galactic Suite Design         
SPANISH AEROSPACE DESIGN COMPANY
Galactic Suites; Galactic Suite; Galactic Suite Space Resort
Galactic Suite Design is an aerospace design company based in Barcelona, Spain. The company develops concepts and designs for aerospace projects.
Galactic habitable zone         
  • The impact of supernovae on the extent of the galactic habitable zone has been extensively studied.
  • The galactic habitable zone is often viewed as an annulus 7-9 kpc from the galactic center, shown in green here, though recent research has called this into question.
  • 400px
IN ASTROBIOLOGY AND PLANETARY ASTROPHYSICS, THE GALACTIC HABITABLE ZONE IS THE REGION OF A GALAXY IN WHICH LIFE MIGHT MOST LIKELY DEVELOP.
Galactic Habitable Zone; User:Wer900/Galactic habitable zone
In astrobiology and planetary astrophysics, the galactic habitable zone is the region of a galaxy in which life might most likely develop. The concept of a galactic habitable zone analyzes various factors, such as metallicity (the presence of elements heavier than hydrogen and helium) and the rate and density of major catastrophes such as supernovae, and uses these to calculate which regions of a galaxy are more likely to form terrestrial planets, initially develop simple life, and provide a suitable environment for this life to evolve and advance.

Βικιπαίδεια

Galactic year

The galactic year, also known as a cosmic year, is the duration of time required for the Sun to orbit once around the center of the Milky Way Galaxy. One galactic year is 230 million Earth years. The Solar System is traveling at an average speed of 230 km/s (828,000 km/h) or 143 mi/s (514,000 mph) within its trajectory around the galactic center, a speed at which an object could circumnavigate the Earth's equator in 2 minutes and 54 seconds; that speed corresponds to approximately 1/1300 of the speed of light.

The galactic year provides a conveniently usable unit for depicting cosmic and geological time periods together. By contrast, a "billion-year" scale does not allow for useful discrimination between geologic events, and a "million-year" scale requires some rather large numbers.