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davidge
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How frequently is collision of stars in galaxies? If there are 100 bi galaxies and 100 bi stars each, then how many collisions should we expect in within, say, 1 year?
davidge said:If there are 100 bi galaxies and 100 bi stars each,
davidge said:then how many collisions should we expect in within, say, 1 year?
Does a stellar merger count as a collision?davidge said:How frequently is collision of stars in galaxies? If there are 100 bi galaxies and 100 bi stars each, then how many collisions should we expect in within, say, 1 year?
I'm pretty sure you have overstated the likelihood of it happening.davenn said:somewhere between zero and none at all
phinds said:I'm pretty sure you have overstated the likelihood of it happening.
stefan r said:Someone should throw out numbers...
The sun's radius is 2.25461×10−8 parsec.
The local stellar density is about 0.14 stars per cubic parsec.
The sun move about 20km/s relative to neighborhood stars. one parsec in 1.5 x 1012 seconds which is about 49,000 years.
1.5 x 1012/ (2.25461×10−8 x 0.14)= 4.75 x 1020 seconds which is
1.5 x 1013 years for a collision.
With 100 billion stars in the milky way might happen in 150 years or so. very rough estimate. Leaning strongly toward none in a given year.
A stellar collision is the coming together of two stars.[1] The mechanisms that drives such collisions include gravity, gravitational radiation, and other mechanisms not well understood. Astronomers predict that events of this type occur in the globular clusters of our galaxy about once every 10,000 years.[2]
Did not square a number.davenn said:If you read the link by BenAS, you will find your estimates are out by a number of magnitudes
I really cannot make sense of that in the context of this threadstefan r said:Did not square a number.
Is also not relevant. If the definition of "collision" is a merger than just coming within 2 solar radii is not a "collision". I thought my concussion was caused by a collision between my skull and pavement. Since my skull did not merge with the cement it must have been a close encounter.
yup, indeed :)Vanadium 50 said:And globular clusters do have evidence of collisions, or at least mass transfer (what does it mean for two gas balls to collide?). These are the so-called blue stragglers.
The frequency of star collisions is relatively low, with estimates ranging from one in every few hundred thousand years to one in every few billion years. This is due to the vast distances between stars in space and the low probability of their paths crossing.
It is difficult to determine the exact number of star collisions in the universe, but it is estimated that there are around 100 million stars in our galaxy alone. With billions of galaxies in the observable universe, the number of star collisions is likely in the billions.
When stars collide, a variety of outcomes are possible depending on the size and type of the stars. Some collisions may result in the merging of the stars, while others may result in the destruction of one or both stars. In some cases, the collision may also trigger the formation of new stars.
Yes, we can observe star collisions happening in real-time. However, these events are relatively rare and difficult to detect due to the vastness of space. Scientists use telescopes and other instruments to observe and study these collisions when they occur.
Scientists study star collisions through a variety of methods such as telescopic observations, computer simulations, and analyzing the remnants of past collisions. They also use data from other astronomical events, such as supernovae, to better understand the physics of star collisions.