RE: General relativity 101 - Gravitational waves in a nutshell by samminator

Viewing a response to: @lemouth/general-relativity-101-gravitational-waves-in-a-nutshell

steemstem · @samminator · Jul 24 '18

$0.03

> A wave does therefore not transport matter but solely energy 

I've been thinking that energy is grouped as matter. I guess I was wrong.

> Gravity is the weakest of all forces, and this weakness must be compensated by large masses.

I've now understood why the sun is able to hold up other planets in the force of gravity - because of its size.

I've learnt a lot from this post. Thanks for sharing

👍 lordneroo, lemouth

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@lemouth · Jul 24 '18

$0.10

> I've been thinking that energy is grouped as matter. I guess I was wrong.

I am not sure to understand the above sentence. Do you mind clarifying?

> I've now understood why the sun is able to hold up other planets in the force of gravity - because of its size.

Not only the size. It is a matter of both its mass and its density. the sun bends the space around it, so that planets can only orbit around it following the curvature.

👍 procrastilearner

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@samminator · Jul 24 '18

I've been thinking that "matter" is anything that has mass and occupies space (okay, that's what we were taught in the elementary school).
And I was also taught that energy is the property of matter.
That was why I assumed that matter and energy are somewhat related.


But when I saw these words "A wave does therefore not transport matter but solely energy". I then realized that "matter" and "energy" are two different concepts.

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@lemouth · Jul 24 '18

$0.13

Being related does not mean they are the same thing. Mass energy is one type of energy. But energy can also be radiated for instance. In the case of waves, energy is transmitted in a way the system does not undergo any global motion.

👍 procrastilearner, lordneroo, samminator

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2 replies

@rudyardcatling · Jul 26 '18

you were taught about matter in elementary school ? lol ... size and mass are not the same like one kilo of lead and one kilo of feathers as the classic story goes , i wish i was taught about matter in elementary school :p

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25 replies