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The Hubble constant is most frequently quoted in km/s/Mpc, which gives the speed of a galaxy 1 megaparsec (3.09 × 10 19 km) away as 70 km/s. Simplifying the units of the generalized form reveals that H 0 specifies a frequency (SI unit: s −1 ), leading the reciprocal of H 0 to be known as the Hubble time (14.4 billion years).
This speed is approximately 300 km/s (Ask the Space Scientist). Therefore, the speed of the Milky Way galaxy is not a single number, its value is relative to the speed of other objects. Patricia Kong -- 1999
The velocity of the galaxy is determined by measuring the redshift of spectral lines in the spectrum of the galaxy. The full optical (visual wavelengths) spectrum of the galaxy is shown at the top of the web page containing the spectrum of the galaxy being measured (see link below).
The Milky Way is a barred spiral galaxy with a D 25 isophotal diameter estimated at 26.8 ± 1.1 kiloparsecs (87,400 ± 3,600 light-years), [10] but only about 1,000 light-years thick at the spiral arms (more at the bulge).
8 Μαρ 2021 · Using a relatively new and potentially more precise technique for measuring cosmic distances, which employs the average stellar brightness within giant elliptical galaxies as a rung on the distance ladder, astronomers calculate a rate — 73.3 kilometers per second per megaparsec, give or take 2.5 km/sec/Mpc — that lies in the middle of three othe...
In this interactive laboratory, you'll investigate for yourself how fast several galaxies are moving. Here's what you'll need: This set of instructions to guide you. The Virtual Spectroscope. This device allows you to observe and compare the patterns of light -- called spectra -- produced by different sources of light.
18 Απρ 2023 · Traveling at the speed of 515,000 mph (828,000 kph), the sun takes 230 million years to complete a full orbit around the galactic center.
