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3 giorni fa · Andromeda Galaxy. A visible light image of the Andromeda Galaxy. Messier 32 is to the left of the galactic nucleus and Messier 110 is at the bottom right. The Andromeda Galaxy is a barred spiral galaxy and is the nearest major galaxy to the Milky Way. It was originally named the Andromeda Nebula and is cataloged as Messier 31, M31, and NGC 224.
- 3.167° × 1°
- (1.5±0.5)×10¹² M☉
- ~1 trillion (10¹²)
2 giorni fa · Relevant phenomena include supernova explosions, gamma ray bursts, quasars, blazars, pulsars, and cosmic microwave background radiation. More generally, astronomy studies everything that originates beyond Earth's atmosphere. Cosmology is a branch of astronomy that studies the universe as a whole. Astronomy is one of the oldest natural sciences.
3 giorni fa · Quasars look a bit like stars but are very different in many ways. They are some of the most distant objects we see, and they put out great amounts of radio energy. Astronomers think they may be the centers of active galaxies that have supermassive black holes.
That's the total number of sources within the Gaia catalogue (specifically DR2), which includes quasars, galaxies, asteroids, stars in neighbouring galaxies and dwarf galaxies, planets, etc, but the vast majority of the number is stars within the galaxy. The Wikipedia article is out of date and uses bad sources.
5 giorni fa · Bell's theorem. Bell's theorem is a term encompassing a number of closely related results in physics, all of which determine that quantum mechanics is incompatible with local hidden-variable theories, given some basic assumptions about the nature of measurement. "Local" here refers to the principle of locality, the idea that a particle can only ...
2 giorni fa · La Basilicata ( AFI: /baziliˈkata/ [9]) è una regione italiana a statuto ordinario dell' Italia meridionale con capoluogo Potenza. Conta 532 897 abitanti. [3] È detta anche Lucania, denominazione che fu ufficiale dal 1932 al 1947 [10] oltre a identificare anticamente una regione dai confini differenti, che inglobava gran parte di quella odierna.
1 giorno fa · Areale attuale della tigre e delle sue sottospecie. La tigre ( Panthera tigris Linnaeus, 1758) [2] [3] è un mammifero carnivoro della famiglia dei felidi. È il più grande dei cosiddetti " grandi felini " che costituiscono il genere Panthera (tigre, leone, giaguaro, leopardo e leopardo delle nevi ).
