Really big. Other globular clusters that orbit the center of our Milky Way as a satellite – i.e.
In other words, astronomers use different methods to determine the distances to objects; the specific method which is used depends on how far away the object is. This is a big number, and so astronomers use the astronomical unit to describe this distance. Astronomers have developed several techniques to indirectly measure the vast distances between Earth and the stars and galaxies. During the 1920's, Edwin Powell Hubble demonstrated that the small hazy patches of light which were then known as "spiral nebulae" are actually entire galaxies containing hundreds of billions of stars. a. Hubble-Lemaître Law In 1914 Vesto Slipher (lived 1870--1963) announced his results from the spectra of over 40 spiral galaxies (at his time people thought the … I just assumed you wanted the average for the stars within our own galaxy. Each black dot on the graph is for one supernova explosion. Although the light year is a commonly used unit, astronomers prefer a different unit called the parsec (pc). Truly huge. In many cases, these methods are mathematically complex and involve extensive computer modeling. Edwin Hubble, redshifted spectra, and distances to galaxies. The methods of determining the distances to the galaxies are summarized in the ``Steps to the Hubble Constant'' section. You just won't believe how vastly, hugely, mindbogglingly big it is. 46 AU Distance Information. Hubble's Distance - Redshift Relation. The graph above shows 4 models for how the average distance between galaxies could change with time, from the past (left) to now (middle) to the future (right hand side). The distance between the Earth and the Sun is about one hundred and fifty million kilometres. If you include the distance between galaxies, the average distance between stars expands significantly.
The thing is, the size of an average galaxy is almost incomprehensibly huge, no matter how much you know about them or how many images and pictures you have seen. The Extragalactic Distance Scale Distances to galaxies and AGNs are important, but direct means of measuring distances may be difficult and very time-consuming. Parallax is the visual effect produced when, as an observer moves, nearby objects appear to shift position relative to more-distant objects. The diagram below shows the position of the sun and two galaxies, G1 and G2. Mind-blowing: Distance between local stars in our galaxy is analogous to 2 grains of sand miles apart 'Space is big. One astronomical unit, or ‘au’, is the distance between the Earth and the Sun.
The graph also shows real data, based on studies of supernovae. What is the distance between the galaxies, G1 and G2? 33 AU b. $\begingroup$ @Sedumjoy Indeed, the distance between galaxies relative to galaxy size is roughly a factor of 100 - still a big difference, but graspable. To measure distances in the universe, we will need to construct what is commonly referred to as a "cosmic distance ladder".
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