Oh it was unclear to me we were talking about field of vision.
Astronomy & Space Exploration
- Thread starter MrMarcello
- Start date
And if you we’re watching earth tv through a telescope from a nearby cluster, Georgie Best would be a bright young prospect and Jimmy Hill would be heading the ball with his chin
Yea I think I saw that on a documentary ages ago about future possible arrays.
Could we combine jwst and hubble to the same effect I wonder. Bet we fecking can
If those moments were broadcast live then they wouldn't need a telescope they could watch it live on their interstellar compatible tvs, which I'm guessing they have.
Don't know that show, I'm an invader zim buff
The first radio broadcast.
On Christmas Eve 1906, Fessenden used a synchronous rotary-spark transmitter for the first radio program broadcast, from Ocean Bluff-Brant Rock, Massachusetts. Ships at sea heard a broadcast that included Fessenden playing O Holy Night on the violin and reading a passage from the Bible.
So aliens on an exo planet with compatible radios 116 light years away can hear this live.
O holy night is one of my favourite pieces of music (weirdly for an atheist)
On Christmas Eve 1906, Fessenden used a synchronous rotary-spark transmitter for the first radio program broadcast, from Ocean Bluff-Brant Rock, Massachusetts. Ships at sea heard a broadcast that included Fessenden playing O Holy Night on the violin and reading a passage from the Bible.
So aliens on an exo planet with compatible radios 116 light years away can hear this live.
O holy night is one of my favourite pieces of music (weirdly for an atheist)
They could be living that close, and there are plenty of planets that close too, which is the exciting bit, even if 116 light years is no distance at all:
https://www.newsweek.com/space-radio-signal-detected-puzzle-scientists-1673586
Yea but why haven't we picked up on their crappy radio broadcasts...They could be living that close, and there are plenty of planets that close too, which is the exciting bit, even if 116 light years is no distance at all:
https://www.newsweek.com/space-radio-signal-detected-puzzle-scientists-1673586
Best case scenario: an exo planet 116ly away could be a a few days/months/years behind us in their technological development, so their said crappy broadcast could be just over the horizon and hopefully SETI will give us their O holy night variation in due course. we live in hope don't we fellow space muppets.
Last edited:
We probably could but the data received would be too sparse to reconstruct any sorta meaningful image I suppose. Here is the coverage (middle plot) of the telescope array for Event Horizaon helped by the rotation of the earth. (there was a great gif showing how it works but I can't find it now)
We couldn't, it's physically impossible. Interferometry works on waves, and while the EHT participants detect and measure wave signals, Hubble and JWST use particle detectors and therefore can't measure the signal phase that's needed for the interferometry calculation.
Oh yeah, you're spot on. I was only thinking about measurements separated by those distances but not the type of measurements.
Same. It’s like cricket.
You think deep space is boring as feck?
And to consider that in some of these galaxies there could be a planet with life, or perhaps multiple planets with life possibly highly advanced and able to communicate and/or travel to one another.
I'm pretty sure most galaxies that are in their prime are teeming with life. We will just never know about it due to distance and technology.
Last edited:
That one is pretty sick. Don't understand why images like that don't start a rebellion over capitalism etc. Or create mass existential crisis.
Considering the size of the universe and the numbers involved, if life does exist then it’s also a safe bet to infer that somewhere, two separate forms of intelligent life that started independently on two different planets became aware of each other or have even communicated.
The chance that can happen for us though is so infinitesimally small due to the distances involved.
Yes exactly that.
Radio waves travel at the speed of light.
But we are still relying on WW2 rocket propulsion technology. Travel outside our solar system is very unlikely given where we are.
Alcubierre drives folks
Most certainly.
When you start thinking about what you're actually looking at... It's so fricking cool!
About 40x slower than the speed of light.
2.6%, not 2.6 times. Still pretty fast.
- Orbital speed of S0–2 at periastron (i.e., closest distance to Sagittarius A*) = approximately 7,000,000 m/s.
- Orbital speed of S0–2 at apastron (i.e., farthest distance from Sagittarius A*) = approximately 450,000 m/s.
- Speed of light = approximately 300,000,000 m/s, so much faster than the orbital speeds of S0–2.
Fascinating. You can see it’s elliptical orbit and is offset by the black hole - the way it speeds up at the bottom and slows down along the top.
Amazing.
The same thing happens with the Earth and its orbit around the Sun when it reaches its perihelion, it’s the conservation of energy in the angular momentum of an elliptical orbit
P.S. Those speeds are not enough to produce perceptible time dilation (relatively), in case you were wondering...
- Orbital speed of S0–2 at periastron (i.e., closest distance to Sagittarius A*) = approximately 7,000,000 m/s.
- Orbital speed of S0–2 at apastron (i.e., farthest distance from Sagittarius A*) = approximately 450,000 m/s.
- Speed of light = approximately 300,000,000 m/s, so much faster than the orbital speeds of S0–2.
The Time Dilation Calculator is fun to play around with. Unfortunately it only goes up to 99.9999999999999999999999999999999999999999999999999999999999999% of the speed of light, after that it just defaults to infinity. Still, at that speed every second for you is a snappy seven hundred and eight sextillion seventy-six quintillion nine hundred and ninety-two quadrillion seven hundred and eighty-nine trillion six hundred and forty billion three hundred and sixty-nine million three hundred and twenty-four thousand two hundred and twenty years on Earth
In a ridiculous hypothetical, where you were in a ship that could go accelerate pretty much instantly to that speed for a second and then slow down back to a few thousand miles an hour, given the dilation experienced, wouldn't that mean you would be left alone in a completely dark universe? Even the black holes would have evaporated by that point surely?
So the FdJ saga will take a couple of seconds then?
Surprisingly, no! There would still be some neutron stars still around, and black holes will last for a long, long time still. The largest could last for as long as 10^100 years, otherwise known as 10 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 years (I think I got that right).
There would be no star formation though, so it wouldn't be a very fun universe to hang out in.
So, basically Detroit.
Not for that specific percentage of the speed of light; you would fall well short of the Dark Era. But if you ramp up the numbers, then yeah, you might reach that stage — or even a new universe, given a long enough timescale and proximity to a spontaneous inflation event.
Spontaneous Inflation and the Origin of the Arrow of Time
But the energy requirements for those as-close-to-c-as-possible speeds are so incomprehensively vast that you would effectively be the reason behind the universe's premature annihilation.
But the energy requirements for those as-close-to-c-as-possible speeds are so incomprehensively vast that you would effectively be the reason behind the universe's premature annihilation.
I can follow this stuff up to a level but I always end up getting hopelessly lost. I know that a lot of energy can produce a black hole - I presume all that energy would wipe out all stars and planets within a ridiculous area?