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What is the Universe expanding into..
What is the Universe expanding into..
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View Poll Results: Do you think there was anything before the big bang?
I don't think there was anything before the Big Bang 16 8.60%
I think something existed before the Big Bang 73 39.25%
I don't think the big bang happened 23 12.37%
I think the universe is part of a mutiverse 92 49.46%
Multiple Choice Poll. Voters: 186. You may not vote on this poll

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Old 1st July 2020, 08:33 PM   #3151
Galu is offline Galu  Scotland
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Join Date: Apr 2018
Quote:
Originally Posted by system7 View Post
But a great film.
Even its science has been analysed! YouTube

"500 turns each and we get to the top!"
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Old 1st July 2020, 08:40 PM   #3152
edbarx is offline edbarx  Malta
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Join Date: May 2018
Duality of matter is a weird thing, with particles exhibiting wave like behaviour in certain circumstances, and particle like behaviour in others. A property of any particle is gravitational potential energy. If a particle travels away from an object, it gains gravitational potential energy. Under Quantum Mechanics a photon can be seen as having a mass equivalent to its energy, since mass is energy. The energy of a photon is given by E = hf, where h is Planck's Constant. Using Einstein's E = mc^2, the 'mass' of a photon becomes, m = hf/c^2.

Does a photon exhibit the behaviour of a mass when the dimensions are hugely macroscopic?
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Any fool can make things bigger, more complex, and more violent. It takes a touch of a genius, and a lot of courage, to move in the opposite direction. [Albert Einstein]
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Old 1st July 2020, 08:47 PM   #3153
Just Dave is offline Just Dave  United States
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Join Date: Jan 2019
Quote:
Originally Posted by Galu View Post
At the end of which I can offer you a 'Moonlight Serenade'!
As a big band trumpet player, I've played bothof those tunes many times.

Thanks for the nice earworms.

Last edited by Just Dave; 1st July 2020 at 08:52 PM.
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Old 1st July 2020, 08:55 PM   #3154
Galu is offline Galu  Scotland
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Join Date: Apr 2018
@ edbarx.

Photons have momentum, given by p = h/λ , where λ is the photon wavelength.

As such, they have the behaviour of mass when it comes to collisions with matter, as is the case in Compton Scattering.
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File Type: gif Compton scattering.gif (10.6 KB, 36 views)
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Old 1st July 2020, 09:12 PM   #3155
Galu is offline Galu  Scotland
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Join Date: Apr 2018
The concept of photons having momentum is more clearly understood in the concept of the solar sail.

A solar sail is a surface thatís attached to lightweight unmanned spacecraft. The sail is designed to reflect incoming photons from the Sun. In doing so, the momenta of the photons is transferred to the sail. This provides a force which pushes the sail, and hence the spacecraft itís attached to, away from the Sun.
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File Type: jpg Solar Sail.jpg (8.2 KB, 35 views)
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Old 1st July 2020, 09:42 PM   #3156
Galu is offline Galu  Scotland
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@ Steve

Just read your 'Bite every in a hazelnut'. A classic! How do you get away with it?
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Old Yesterday, 09:08 PM   #3157
Galu is offline Galu  Scotland
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Join Date: Apr 2018
Default Pluto: Back From The Dead

There was a new programme on the dwarf planet this evening (repeated on BBC2 on Thursday at 11.30pm and available on BBC iPlayer).

The New Horizon space probe flyby in 2015 revealed Pluto to be an active and complex world, with mountains carved from ice, a nitrogen glacier that appeared to be moving and a recently active volcano. Scientists have even started to speculate that there may even be alien life on Pluto today.
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File Type: jpg Glacial Flows on Pluto.jpg (71.5 KB, 13 views)
File Type: jpg Pluto and its moon Charon.jpg (69.0 KB, 13 views)
 

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