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- πώς χρησιμοποιείται η λέξη
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- χρησιμοποιείται πιο συχνά στον προφορικό ή γραπτό λόγο
- επιλογές μετάφρασης λέξεων
- παραδείγματα χρήσης (πολλές φράσεις με μετάφραση)
- ετυμολογία
Τι (ποιος) είναι G-dwarf problem - ορισμός
G-dwarf problem
In astronomy, the G-dwarf problem refers to the apparent discrepancy in the distribution of metallicity levels in stars of different populations as compared to closed box models of galactic chemical evolution. According to closed box models, which represent galaxies without outside non-metallic material inflow, the distribution of metallicity levels in stars should follow a logarithmic curve.
G-type main-sequence star
STELLAR CLASSIFICATION
Yellow dwarfs; G-type star; G v star; Sunlike; G-type main sequence; Type-G star; G-type dwarf; G V star; G-dwarf; G-type main sequence star; G2V; Yellow dwarf star; G type stars; Class G stars; G-type main-sequence stars; Yellow main sequence; Class G star; Yellow Dwarf (star)
A G-type main-sequence star (Spectral type: G-V), also often, and imprecisely called a yellow dwarf, or G star, is a main-sequence star (luminosity class V) of spectral type G. Such a star has about 0.
Dwarf galaxy problem
THE FACT THAT THE NUMBER OF OBSERVED DWARF GALAXIES IS ORDERS OF MAGNITUDE LOWER THAN EXPECTED FROM NUMERICAL COSMOLOGICAL SIMULATIONS
Missing dwarf galaxy problem; Missing dwarf problem; Missing satellites problem
The dwarf galaxy problem, also known as the missing satellites problem, arises from a mismatch between observed dwarf galaxy numbers and collisionless numerical cosmological simulations that predict the evolution of the distribution of matter in the universe. In simulations, dark matter clusters hierarchically, in ever increasing numbers of halo "blobs" as halos' components' sizes become smaller-and-smaller.
