space questions

[Skashion]

For a stationary observer watching both these things coming towards each other it is correct that the relative velocity of the two is greater than light speed, however I was making the point that from the point of view of one of the high speed objects travelling at close to light speed, the other one coming towards it at close to light speed would not be perceived as going faster than light due to Special Relativity.

Frames of references are tricky fuckers aren't they?

 

[west didsblue]

For a stationary observer watching both these things coming towards each other it is correct that the relative velocity of the two is greater than light speed, however I was making the point that from the point of view of one of the high speed objects travelling at close to light speed, the other one coming towards it at close to light speed would not be perceived as going faster than light due to Special Relativity.

Frames of references are tricky fuckers aren't they?

Yep

 

[Lavinda Past]

How have I got through life without being as brainy as some of the boffins on this thread?

Perhaps it's because they know lots about things that don't actually matter to people like me.

Lavinda + happy healthy wife and kids + roof over head + food on table + season card = Utopia

 

[TangerineSteve17]

Got a few questions if anyone knows the answers.

You know like the earth is tilted, spinning on an axis, would that mean we have an answer for the question "what it straight up?" Too have calculated we are on tilt. How did find out what is up? Or did we just use the north pole or something? But that wouldn't actually be straight up. Actually we know other planets are on tilt. How do we have a universal meaning of "Straight up?" is there even a straight up? Or for that matter true lefts and rights?

Also, what could cause a Gas Planet to be knocked off it's orbit? If Jupiter was hit directly by and asteroid bigger than Jupiter what would happen there? Do such large asteroids exist?

If the universe does 'The Big Crunch' and it all comes back, could the gravity be so great as to pull parts of another universe in, if it was close? and if another universe existed at all?

Apologies if these are stupid questions.

 

[TCIB]

Got a few questions if anyone knows the answers.

You know like the earth is tilted, spinning on an axis, would that mean we have an answer for the question "what it straight up?" Too have calculated we are on tilt. How did find out what is up? Or did we just use the north pole or something? But that wouldn't actually be straight up. Actually we know other planets are on tilt. How do we have a universal meaning of "Straight up?" is there even a straight up? Or for that matter true lefts and rights?

Also, what could cause a Gas Planet to be knocked off it's orbit? If Jupiter was hit directly by and asteroid bigger than Jupiter what would happen there? Do such large asteroids exist?

If the universe does 'The Big Crunch' and it all comes back, could the gravity be so great as to pull parts of another universe in, if it was close? and if another universe existed at all?

Apologies if these are stupid questions.

These are just references to help the human mind really.
For example we judge up and down essentially by how we revolve around our star, that is our reference point.
That and how gravity affects us here on earth.


A gas planet would need another gas giant to cross it's path, a rogue planet.
That or a rogue star.

Asteroids that large do not exist as far as we know. The mass would be to much for it's constituent ingredients to sustain. Basically a rock that big would destroy it's self via it's own immense gravity.
It would also be classed as a "rogue planet" at such a size, not an asteroid.

We believe that Mars is smaller than us due to jupiter moving inwards and taking it's lunch so to speak.
It took Saturn to give it a gravitational bump to knock it back out.

 

[Bill Walker]

If you could somehow travel 100 million light years from earth in an instance and you had an extremely powerful telescope pointed at earth, that could see everything. Would you see dinosaurs?

No if your travel was instant you would see the Earth in its present day..............obviously

 

[andyhinch]

If you could somehow travel 100 million light years from earth in an instance and you had an extremely powerful telescope pointed at earth, that could see everything. Would you see dinosaurs?

No if your travel was instant you would see the Earth in its present day..............obviously

Not exactly true that mate.

 

[Zubrman]

To answer the original question, no... it doesn't matter how strong a telescope is, it can still only register or magnify the light that reaches it. If you could be 300,000 light years away, you would only be able to reassemble the particles of light which managed to make the journey. Which on a solar level is actually quite a bit. Nothing on a planetary level though. Just not a strong enough torch to shine that far.

On a super kickass note though, we might have made the first baby-step breakthrough in traveling light years away. It turns out you just have to stand still and move space instead: <a class="postlink" href="http://io9.com/5963263/how-nasa-will-build-its-very-first-warp-drive" onclick="window.open(this.href);return false;">http://io9.com/5963263/how-nasa-will-bu ... warp-drive</a>

Sweet shit.

So what stops the light from my torch going on for ever then?

The batteries will run out, silly.

 

[TangerineSteve17]

Got a few questions if anyone knows the answers.

You know like the earth is tilted, spinning on an axis, would that mean we have an answer for the question "what it straight up?" Too have calculated we are on tilt. How did find out what is up? Or did we just use the north pole or something? But that wouldn't actually be straight up. Actually we know other planets are on tilt. How do we have a universal meaning of "Straight up?" is there even a straight up? Or for that matter true lefts and rights?

Also, what could cause a Gas Planet to be knocked off it's orbit? If Jupiter was hit directly by and asteroid bigger than Jupiter what would happen there? Do such large asteroids exist?

If the universe does 'The Big Crunch' and it all comes back, could the gravity be so great as to pull parts of another universe in, if it was close? and if another universe existed at all?

Apologies if these are stupid questions.

These are just references to help the human mind really.
For example we judge up and down essentially by how we revolve around our star, that is our reference point.
That and how gravity affects us here on earth.


A gas planet would need another gas giant to cross it's path, a rogue planet.
That or a rogue star.

Asteroids that large do not exist as far as we know. The mass would be to much for it's constituent ingredients to sustain. Basically a rock that big would destroy it's self via it's own immense gravity.
It would also be classed as a "rogue planet" at such a size, not an asteroid.

We believe that Mars is smaller than us due to jupiter moving inwards and taking it's lunch so to speak.
It took Saturn to give it a gravitational bump to knock it back out.

Cheers pal.

 

[Bill Walker]

If you could somehow travel 100 million light years from earth in an instance and you had an extremely powerful telescope pointed at earth, that could see everything. Would you see dinosaurs?

No if your travel was instant you would see the Earth in its present day..............obviously

Not exactly true that mate.

obviously :)