there is another near earth crosser tomorrow

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I'm trying to start learning this stuff. My HS daughter is really pushing to go into astro physics for college. I'm a bit of a nerd at times but this is kind of next level and I'm getting left behind. I sent this to her.
Thanks for sharing!

Pretty cool. It's interstellar. Just passing through never to be seen again is why it's significant.
Not like the other near earth objects that circle back in the future in the suns gravitational pull.

ETA: 37 miles/sec
10-20 Kilometers wide (unless it's made of ice)
https://www.sciencealert.com/i...through-solar-system

After reading the linked articles, I wondered how it got its speed. Googling found this:

Interstellar asteroids like 'Oumuamua and the recently discovered A11pl3Z acquire their high speeds through a combination of initial velocity from their home star systems and further acceleration mechanisms encountered during their journey through interstellar space

1. Initial Velocity:
Gravitational slingshots: Interstellar objects can be ejected from their birth star systems due to gravitational interactions with massive bodies, similar to how space probes use gravity assists from planets to increase speed

2. Further Acceleration:
Relative velocity to the Sun: As an object enters a star system like ours, it gains speed due to the gravitational pull of the star. However, objects like 'Oumuamua were observed to be traveling faster than the Sun's gravity alone could explain.
Outgassing: One leading hypothesis for 'Oumuamua's observed acceleration is that it behaved like a comet and released trapped hydrogen gas as it warmed up near the Sun. This outgassing acts like a small thruster, increasing the object's speed

Important Notes:
While gravity plays a role in attracting and accelerating interstellar objects as they enter a star system, the high speed observed in objects like 'Oumuamua indicates that they must have already possessed considerable speed before entering our solar system.
The phenomenon of outgassing was initially not expected for 'Oumuamua because no visible coma (gas and dust tail) was observed. However, researchers have proposed that the released gases might have been difficult to detect.
New interstellar objects like A11pl3Z continue to be discovered, and further observations will help us better understand the diverse mechanisms that contribute to their speeds and trajectories

quote:

Originally posted by 6guns:
2. Further Acceleration:
Relative velocity to the Sun: As an object enters a star system like ours, it gains speed due to the gravitational pull of the star. However, objects like 'Oumuamua were observed to be traveling faster than the Sun's gravity alone could explain.
Outgassing: One leading hypothesis for 'Oumuamua's observed acceleration is that it behaved like a comet and released trapped hydrogen gas as it warmed up near the Sun. This outgassing acts like a small thruster, increasing the object's speed.

Sounds plausible, but with just a little analytical thought, it has to be BS. What phenomena can point these "jets" only in the main direction of travel? Why wouldn't they have an similar chance of pointing in random directions including forward (which would retard their acceleration relative to the Sun's gravitational pull)? The fact that the side of the asteroid facing the Sun would warm first implies that jets would occur on that side in greater numbers and strength.

More likely :-) these are being guided by some intelligence to facilitate travel between star systems. Aliens, perhaps? Just common sense (where's that tongue-in-cheek emoji?)

It's already traveling inertia? Got me?

I think they said Oumuamua actually increased speed as it was outbound which was unexplainable. Thats was why some thought it was not a natural object. Aliens?

Almost every day there is 'news' from the folks running the James Webb telescope that knocks 'everything we thought we knew about the cosmos' for six.

Not only is almost everything we thought we knew is mistaken, but the theories on which those suppositions were based are also found to have been totally misplaced. The Cosmos, Jim, is not only at least a thousand times bigger than we even imagined, but we can't even imagine how it REALLY began. Yet another 'blank, empty void' somewhere out there, beyond that other 'blank empty void, that surprised us a few years ago - the 'deep field', remember? - has another 7000 galaxies in it.

As well as another couple of 'blank empty voids'......

quote:

Originally posted by 6guns:
After reading the linked articles, I wondered how it got its speed. Googling found this:

There are things that affect trajectories: accelerating, decelerating, deflecting, etc. as Google's AI summary points out, but they don't necessarily need acceleration to be seen as being really fast, relative to us.

Velocity is relative. We think of the solar system here as being a stable thing we spin and rotate in .... while in fact it's orbiting the Milky Way, which itself is not static relative to the galactic center. According to this site article we're moving over 500K miles/hr relative to the center.

So stuff that doesn't share our solar system's trajectory (or as we hurtle toward that stuff...everything's relative) might not need acceleration to have a very, very high velocity relative to us - it could already be closing quite rapidly on its own.

quote:

Originally posted by tacfoley:
Almost every day there is 'news' from the folks running the James Webb telescope that knocks 'everything we thought we knew about the cosmos' for six.

Not only is almost everything we thought we knew is mistaken, but the theories on which those suppositions were based are also found to have been totally misplaced. The Cosmos, Jim, is not only at least a thousand times bigger than we even imagined, but we can't even imagine how it REALLY began. Yet another 'blank, empty void' somewhere out there, beyond that other 'blank empty void, that surprised us a few years ago - the 'deep field', remember? - has another 7000 galaxies in it.

As well as another couple of 'blank empty voids'......

I know when I read that I thought its almost more similar to cellular growth like in an organism. Like we are on a cell looking out at other cells. Or Atoms.

quote:

Originally posted by dsiets:
Pretty cool. It's interstellar. Just passing through never to be seen again is why it's significant.

Still, I wouldn't vacation in Buenos Ares

quote:

Originally posted by RichardC:

Still, I wouldn't vacation in Buenos Ares

Why? I want to know more!

quote:

Originally posted by AllenInAR:

quote:

Originally posted by RichardC:

Still, I wouldn't vacation in Buenos Ares

Why? I want to know more!

Are you a citizen?

I served.

So much from that movie that should be applied today.

quote:

Originally posted by RichardC:

quote:

Originally posted by dsiets:
Pretty cool. It's interstellar. Just passing through never to be seen again is why it's significant.

Still, I wouldn't vacation in Buenos Ares

I'm from Buenos Ares! And I say, "Kill 'em all!"

And we're drifting.

Well, it's gone now, Jim, never to be seen again - ever.

And I can't help but think how many people I wish were on it.

Of course, the really SCARY thing would be it if turned around and came back.

Isn't there another coming in December? Or did I misread something.

Ah, I think we're talking about two different things. 31/Atlas gets closest to Earth in October.