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5 dni temu · The solar system is about 30,000 light-years from the centre of the Milky Way Galaxy. The Galaxy itself is thought to be about 100,000 light-years in diameter.
- Star Populations and Movement
Milky Way Galaxy - Star populations and movement: The...
- Structure, Dynamics, Stars
Milky Way Galaxy - Structure, Dynamics, Stars: The first...
- Kepler’s Nova
Kepler’s Nova, one of the few supernovae (violent stellar...
- Crab Nebula
Crab Nebula, (catalog numbers NGC 1952 and M1), probably the...
- Tycho’s Nova
Tycho’s Nova, one of the few recorded supernovas in the...
- Andromeda Galaxy
Andromeda Galaxy, (catalog numbers NGC 224 and M31), great...
- Ursa Minor
Ursa Minor, in astronomy, a constellation of the northern...
- Orion Nebula
Orion Nebula, (catalog numbers NGC 1976 and M 42), bright...
- Star Populations and Movement
2 dni temu · A terrestrial planet of the right size. Planets of the Solar System, shown to scale. Rare Earth argues that complex life cannot exist on large gaseous planets like Jupiter and Saturn (top row) or Uranus and Neptune (top middle) or smaller planets such as Mars and Mercury.
3 dni temu · the distance that light travels in a vacuum in 1 year; 5.88 trillion miles or 9.46 trillion kilometers. synonyms: light year. see more.
4 dni temu · Bright nebulosity in the Pleiades (M45, NGC 1432), distance 490 light-years. Cluster stars provide the light, and surrounding clouds of dust reflect and scatter the rays from the stars. (more)
4 dni temu · The naked-eye stars are nearly all intrinsically brighter than the Sun, but the opposite is true for the known stars within 20 light-years of the Sun. The bright stars are easily seen at great distances; the faint ones can be detected only if they are close.
1 dzień temu · The physical universe is defined as all of space and time [a] (collectively referred to as spacetime) and their contents. [10] Such contents comprise all of energy in its various forms, including electromagnetic radiation and matter, and therefore planets, moons, stars, galaxies, and the contents of intergalactic space. [21] [22] [23] The universe also includes the physical laws that influence ...
3 dni temu · A megaannus (Ma) represents one million (10 6) years. The geologic time scale or geological time scale ( GTS) is a representation of time based on the rock record of Earth. It is a system of chronological dating that uses chronostratigraphy (the process of relating strata to time) and geochronology (a scientific branch of geology that aims to ...
