What Are the Fastest Moving Objects in the Universe?

  • Thread starter EskWIRED
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In summary: Place likeSpace.In summary, the conversation discusses the velocities of large objects in the universe, including stars, galaxies, and supernova remnants. It is noted that distant galaxies are moving very fast due to the expansion of the universe, and individual objects can have peculiar motion or velocities in the order of 100s km/s. Some examples of high-velocity objects mentioned include the Andromeda Galaxy, runaway stars, and pulsars. While there are no high-velocity objects headed towards our solar system, it is noted that space is vast and difficult to navigate.
  • #1
EskWIRED
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I'm wondering what sorts of velocities exist for large objects in the universe.

Specifically, I'm wondering whether huge objects exist which are traveling across the cosmos at huge velocities, and what those objects and velocities might be.

For example, are there stars moving in intergalactic space which are "whizzing past" other random objects that might wander into their paths? How about within the milky Way Galaxy?

What sort of relative velocities are galaxies moving at with respect to each other? Are there any examples of galaxies traversing space at an extraordinarily high velocity compared to the norm? In general, are galaxies relatively static WRT each other, or are they all moving around in all directions at significant velocities?
 
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  • #2
In general, as a result of the expansion of the universe, distant galaxies are moving very fast compared to us.
 
  • #3
Uhh, this depends on whether you count the velocity due to the expansion of the universe or not. If you do, there are galaxies out there that are receding faster than light. But they aren't "moving through space" at that velocity. Otherwise I know there are large objects traveling very fast. For example, our entire solar system travels at about 251 km/s around the galactic center.
 
  • #4
Thanks for the replies so far. I wasn't really thinking about the expansion of the universe in general or the relatively uniform orbit of stars around the galactic center.

But instead, I was wondering if individual objects of size (I suppose at least a solar mass or two) were traveling by themselves in directions other than along with their neighbors?

Are there any galaxies rushing towards each other? Any stars zipping along at a severe angle to the galactic plane? At what sorts of velocities?
 
  • #5
EskWIRED said:
Thanks for the replies so far. I wasn't really thinking about the expansion of the universe in general or the relatively uniform orbit of stars around the galactic center.

But instead, I was wondering if individual objects of size (I suppose at least a solar mass or two) were traveling by themselves in directions other than along with their neighbors?

Are there any galaxies rushing towards each other? Any stars zipping along at a severe angle to the galactic plane? At what sorts of velocities?

Galaxy of Andromeda is rushing towards our own galaxy.
 
  • #7
It's called "peculiar motion" or "peculiar velocity", and if you look up a star or a galaxy on wikipedia or a catalogue of stellar objects, it's usually noted - if measurable.
It is defined with respect to some rest frame, usually the "local standard of rest", which is the frame of reference of the solar system as it follows its orbit around the galactic centre.

Most objects, be it stars or galaxies, exhibit peculiar motion. Stars don't follow strictly regular obits, galaxies gravitationally attract each other and then collide etc.

Our neighbouring Andromeda Galaxy is currently flying at some 300 km/s toward us(relative to the frame of reference at rest with Milky Way), and is only going to accelerate as it gets closer.

Individual high speed stars can have peculiar velocities in the order of magnitude of 100s km/s, like this one:
http://arxiv.org/abs/astro-ph/0410673
(here's a pop-sci article about the same thing:)
http://www.astronomy.com/en/News-Observing/News/2004/11/High-speed star flees Tychos blast.aspx

Here's some more reading:
http://en.wikipedia.org/wiki/Stellar_kinematics
Or search http://arxiv.org/ for "high-velocity stars" "runaway stars", "galactic collision" etc.
 
  • #8
Bandersnatch said:
It's called "peculiar motion" or "peculiar velocity", and if you look up a star or a galaxy on wikipedia or a catalogue of stellar objects, it's usually noted - if measurable.
It is defined with respect to some rest frame, usually the "local standard of rest", which is the frame of reference of the solar system as it follows its orbit around the galactic centre.

Most objects, be it stars or galaxies, exhibit peculiar motion. Stars don't follow strictly regular obits, galaxies gravitationally attract each other and then collide etc.

Our neighbouring Andromeda Galaxy is currently flying at some 300 km/s toward us(relative to the frame of reference at rest with Milky Way), and is only going to accelerate as it gets closer.

Individual high speed stars can have peculiar velocities in the order of magnitude of 100s km/s, like this one:
http://arxiv.org/abs/astro-ph/0410673
(here's a pop-sci article about the same thing:)
http://www.astronomy.com/en/News-Observing/News/2004/11/High-speed star flees Tychos blast.aspx

Here's some more reading:
http://en.wikipedia.org/wiki/Stellar_kinematics
Or search http://arxiv.org/ for "high-velocity stars" "runaway stars", "galactic collision" etc.

Good stuff! Thanks.
 
  • #9
Supernova Remnants like Neutron stars and maybe black holes have the most kinet energies. Since Neutron stars are not that massive (2 solar masses is the upper limit) they can have very high velocities.

If you're looking for huge Velocities Neutron stars can have up to 1000 km/s (whatch out for "guitar Nebula") and many of them effectively surpassing the galaxy escape velocity (300 km/s). Some of the latest observable pulsars are candidates for even higher velocities.

en.wikipedia.org/wiki/Pulsar_kicks
 
  • #10
Raghnar said:
Supernova Remnants like Neutron stars and maybe black holes have the most kinet energies. Since Neutron stars are not that massive (2 solar masses is the upper limit) they can have very high velocities.

If you're looking for huge Velocities Neutron stars can have up to 1000 km/s (whatch out for "guitar Nebula") and many of them effectively surpassing the galaxy escape velocity (300 km/s). Some of the latest observable pulsars are candidates for even higher velocities.

en.wikipedia.org/wiki/Pulsar_kicks

That is exactly the sort of stuff I was wondering about! Thanks.

Are any of those high-velocity neutron stars headed our way?
 
  • #11
EskWIRED said:
Are any of those high-velocity neutron stars headed our way?
Not in such a way that they would come close to our solar system. Space is BIG.
 
  • #12
mfb said:
Space is BIG.
Space is big.
Space is dark.
It's hard to find
A place to park.
Burma Shave.
 

What does "fast" mean in the context of speed?

"Fast" typically refers to a high rate of motion or velocity. It is a relative term and can vary depending on the context and the object being measured.

How is speed measured?

Speed is typically measured as distance traveled per unit of time, such as miles per hour (mph) or meters per second (m/s). The measurement of speed can also be affected by factors such as acceleration, direction, and obstacles.

What is the difference between speed and velocity?

Speed and velocity are often used interchangeably, but they have distinct meanings in physics. Speed refers to the distance traveled per unit of time without regard to direction, while velocity refers to the rate of change of position in a specific direction.

What are some examples of fast speeds?

Some examples of fast speeds include the speed of light, which is about 186,282 miles per second, the speed of sound, which is about 767 miles per hour, and the speed of a bullet, which can range from 1,500 to 2,800 feet per second depending on the type of gun and ammunition used.

How does speed impact daily life and scientific research?

Speed plays a significant role in many aspects of daily life and scientific research. In everyday life, it affects transportation, communication, and the efficiency of various tasks. In scientific research, speed can determine the outcome of experiments and the development of technology and can also be used to measure and understand natural phenomena.

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