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Voyager 1 stops communicating with Earth

cnn.com

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Re: Voyager 1 stops communicating with Earth

#571

Post by lanstin »

looping8 wrote: post #462
smcleod wrote: post #459

Earlier quoted context omitted.

Oh man I’d love to have all the data of my parents, grandparents etc… even just having analogue records is interesting I’d love to know what kinds of hobbies they had like collecting digital music, art, books etc.

I think you and the previous commenter have very different opinions on what "all" means. Connecting to parents and grandparents by knowing what art they like is one thing, but, for example, I have hundreds of photos of random bills and documents that I need to remember for later. None of my descendents would ever want to read through that unless they were investigating my life like in a movie.

My most frequent type of data in my personal archive is screen shots of tumblr posts that my oldest child like to take when they were 12 and we all shared photo saving account.

I do snap bills and white boards to remember but not with the eager enthusiasm of the long since grown up child.

Re: Voyager 1 stops communicating with Earth

#572

Post by epcoa »

hunter2_ wrote: post #526
Gabrys1 wrote: post #428

Earlier quoted context omitted.

At some point there were burners with speeds like 48x, and MAX reads at 48x, so the writed were in practice faster than reads (but only marginally)

This is the era I'm referring to, and I recall the difference being a bit beyond marginal. Literally the verification (i.e. read) phase of the burning sequence would take several times longer... in practice, not in terms of advertised maximums. Maybe it would read data discs at 48x but it would refuse to read audio discs beyond 8x or something like that. Same goes for ripping software like Exact Audio Copy (EAC); it…

You and the GP are misremembering (also the abundant misinformation sticking around the web is of no help). CD-R are mostly obsolete but some of us still have working equipment and do continue to burn CD-R, so that era hasn't completely ended.

No idea exactly what you're referring to taking several times longer, perhaps software was misconfigured. However what is more likely: The market was flooded with terrible quality media, combined with touting write speeds that were more for marketing than any concern for integrity, it was easy to burn discs just at the edge of readability, with marginal signal and numerous errors. This would cause effective read speed to be terrible, but this was more an indication that the discs were poor quality and/or poorly written then any inherent limitations in the process or how drives worked.

There are 48X "max" CD burners. But that maximum is no different than the maximum for reading. It's MAX because that speed is only attainable at the extreme outside of the disc. These higher speed drives operate with constant angular velocity (essentially a fixed RPM). In order to attain 52X at the inside of the disc would require a speed of around 30k RPM and no CD drive gets anywhere near that (though this was a common misconception). The top RPM for half height drives is around 10k - or about 50x the linear velocity of a CD at the outside.

Currently I usually use an Lite-On iHAS124 DVD/CD burner made in the last 6 years. It will write at up-to 48X and this speed is the maximum. The average burn speed for an entire disc when using "48x" is about 25x, or just about 3 minutes for the disc. For supported media it runs at a constant angular velocity around 10k RPM.

Exact Audio Copy / Red Book CD audio ripping is an entirely different subject. It can take longer due to cache busting and other issues that have nothing to do with the physical capabilities of the drive and more to do with the difficulty of directly streaming Red Book Audio, and issues with specific drives and their firmware. You can read at top speed though with a properly configured setup, I do it all the time.

Re: Voyager 1 stops communicating with Earth

#573

Post by lanstin »

blauditore wrote: post #437
londons_explore wrote: post #384

Earlier quoted context omitted.

If the contents of your computer is anything like the contents of most old people's attics, there is a good chance your descendants really don't want to go through all of it. They'll just chuck it in the trash without even opening it. Turns out the next generation has their own life to worry about, and doesn't care much for their ancestors' stuff (unless it's money... they love money...).

I don't think this is universally true. Some people actually make an effort to sort the stuff of their grandparents in the attic and figure out what still has some (emotional) value. But it's probably a minority of people.

It's the volume problem - I'm happy to read handwritten pages of my mom's diary from the 1960s, but the reams of laser printer out put from her master's degree in 2000s? Not so much.

Re: Voyager 1 stops communicating with Earth

#574

Post by sanderjd »

ikiris wrote: post #342
RheingoldRiver wrote: post #309

Earlier quoted context omitted.

That makes sense as far as explaining another situation where you would see a similar pattern, but it doesn't really explain why. What's the equivalent of the land surrounding the cove here? The sun's gravity well? But that's a gradual drop-off, are we looking at the distance where the gravitational pull on particles is canceled out by some other force?

Hydraulic Jump on interstellar scale. Heliopause. The heliopause is the theoretical boundary where the Sun's solar wind is stopped by the interstellar medium; where the solar wind's strength is no longer great enough to push back the stellar winds of the surrounding stars. This is the boundary where the interstellar medium and solar wind pressures balance.

Interesting! What is the interstellar medium? Is it entirely the combined stellar winds of all the other stars, or are there other components?

My initial intuition was to wonder why the vectors of all the other stellar winds wouldn't be expected to nearly cancel each other out, but then it seems like the ones that would be pushing in the same direction as the sun's would have been blocked on the other side of the sphere, so it does seem to make sense that the net direction would be to point inward. But then I realized that I have no idea if any of that reflects an accurate mental model of what's going on :)

Re: Voyager 1 stops communicating with Earth

#575

Post by [deleted] »

gzer0 wrote: post #282

One of my favorite facts ever is that Voyager 1 contains something called the Voyager Golden Record [1]. It has the following quote written: This is a present from a small, distant world, a token of our sounds, our science, our images, our music, our thoughts and our feelings. We are attempting to survive our time so we may live into yours. I get chills everytime I think about this. I hope we can recover from this ev…

[deleted]

Re: Voyager 1 stops communicating with Earth

#576

Post by boringg »

ta8645 wrote: post #302
whalesalad wrote: post #296

Earlier quoted context omitted.

1 million miles per day is an insane figure

And yet it's a vanishingly small distance on the scale of the universe. Mind bending.

Exactly - that's the part thats truly amazing. 30000 years to the outside of the oort cloud - thats still in our system (border of it) - not even scratching the universe in the faintest.

Re: Voyager 1 stops communicating with Earth

#577

Post by leptons »

bmitc wrote: post #401
leptons wrote: post #376

Earlier quoted context omitted.

>The article even mentions that they feel the spacecraft is receiving and processing the commands. There's just no response. That is by definition "one way communication". You're saying it's not communication, but it absolutely is. I'm not sure why you can't accept that.

Jesus christ. I'm not not accepting that. So just to end this, what would you and the others like the title to be given the article is perfectly clear and with a title that is substantively different? So we don't have to non-discuss this anymore.

You're entitled to be as obstinate as you want to be, and as wrong as you want to be - I don't really care what you do. The fact is, sending information to a receiver that is receiving is in fact the definition of one-way communication, whether you want to refute it or not. You're dying on this hill.

Re: Voyager 1 stops communicating with Earth

#578

Post by murkt »

slenk wrote: post #559
murkt wrote: post #363

Earlier quoted context omitted.

CD drive speeds were written like 48/8/8, which stands for 48x for reading, 8x for writing CD-Rs, and 8x for re-writing CD-RWs.

Yes, but WHY can it only write at 8x?

As explained in the nearby comments in more details, it needs more time to heat up a spot on the disk, than to see a reflection from said spot.

Re: Voyager 1 stops communicating with Earth

#579

Post by financypants »

mcmoor wrote: post #386
financypants wrote: post #372

Earlier quoted context omitted.

I wonder if this same law applies to distance satellites like Voyager get away from earth. Like we sent out voyager 46 years ago, but in 100 years, we will send out another satellite that will very quickly catch up to Voyager and outpace it

There's certainly some people who're troubled with this problem https://en.m.wikipedia.org/wiki/Interstellar_travel#Wait_cal... https://tvtropes.org/pmwiki/pmwiki.php/Main/LightspeedLeapfr...

Thanks for this. I’ve been thinking about “lightspeed leapfrog” for many years but never searched it up!

Re: Voyager 1 stops communicating with Earth

#580

Post by ddingus »

mtsr wrote: post #399
vasco wrote: post #382

Earlier quoted context omitted.

We don't even have a world government yet! It's very disorganized still at home to receive guests, I agree.

Human diversity being what it is, I doubt a world government is desirable at all. But maybe we can agree on some basics around fairly sharing food and toys and not trying to steal the other kids toys (or even half their yard).

I agree, and I think our biggest challenge is actually Mutual understanding and respect. We don't need one government to organize as a species and get to where we could become a peer with other advanced ones that we are imagining today. But we need to understand ourselves well enough to get along at a bare minimum.
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