Struggling with Meaninglessness

searching meaning in meaninglessness

Archive for the ‘Astrophysics’ Category

Space Travel

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I’ve personally uploaded this video to YouTube because i think what Michio Kaku and Neil deGrasse Tyson were explaining are pretty interesting.

Watch out for the last 2 minutes of the video.

 

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Written by elan85

March 9, 2008 at 1:16 pm

Posted in Astrophysics

Galactic Civilizations

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I was reading a rather fascinating article on Reddit.com about the four types of galactic civilization we have in this universe. Basically, according to the article, our universe consists from Type 0, the most primitive form of civilization such as our Earth, to Type 3, the most advanced kind of civilization. In the Type 3 Civilization, these beings have mastered the capabilities of doing ‘science fiction-ish’ stuffs such as traveling through time by manipulating worm-hole, ripping space time, traveling faster than the speed of light, colonizing galaxies, creating their own universe and so on. They are basically million of years more advanced than earthlings and has mastered the art of physics.

And so i asked myself the ultimate question – these stuffs are so beyond human-like that they seem so impossible to happen. Are these physicists serious about it? More importantly, i was seeking the logic and reasoning behind these seemingly affirmed theories by physicists. And so, i searched around YouTube and i found a video of Michio Kaku explaining about these galactic civilizations.

Perfect. Michio Kaku is my living Einstein.

Part 1- Michio Kaku On Aliens, On Physics …

Part 2: Michio Kaku On Civilizations Types I,II & III

 

Nobody can explain astrophysics better than Michio Kaku do. Simple yet elegant.

Written by elan85

January 10, 2008 at 9:23 pm

Posted in Astrophysics, Cosmology

Motion @ space

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(This is a continuation from my previous post …)

Whenever we are driving a car, we place our foot on the accelerator paddle to keep the car moving. Otherwise, the car will slow down and eventually stop moving. Same thing goes when we take a walk, we need to keep moving our muscles to make forward steps. Stop moving our muscles, and our body will be completely stationary. Make sense, right?

However, this logic is only applicable within the earth boundary. Beyond earth, this logic is absolutely invalid. The truth is, according to Newton, once an entity is in initial motion, it will remain in motion. This condition is known as inertia. Instead, a force is required to slow down or stop the motion. On earth, we have a natural force – gravity, which acts as the force of friction to halt objects from moving non-stop.

In space, as we know, it is all vacuum. Therefore, there’s almost no force to counteract the orbit movement and momentum of the earth (except for gravitational friction emitted by nearby planets, sun and moon which are extremely insignificant to cause visible effect). Just like light, it will keep traveling on and one until something major interrupts with the traveling process. (For instance, if a huge asteroid coming from an opposite direction of earth and hit us, it will slow down the speed of earth’s orbit movement. But i guess all of us will be dead by then if something as big as that hit us.)

Next question. What kicked start the movements of planets to go around the sun? What caused the earth to rotate around the sun in the first place?

The momentum was actually initiated from the rotation of the protostar. Protostar is basically the second stage of a star’s life cycle (Nebula is first) and is formed through clumps of dense gas and dust which rotate and form a disk. Hence, protostar pulls the planets within its gravity around during the formation stage and these planets danced around the big-bright-eye ever since then. See the picture below to get a rough idea.

(credit: daviddarling.info)

 

I hope i can write more about star’s life cycle in the near future … I have so many things that i wanna write, just need to find the time to articulate them out.

Written by elan85

November 18, 2007 at 7:29 pm

Posted in Astrophysics, Physics

General Theory of Relativity

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In my previous post, i mentioned about Einstein’s theory of how planets orbit around the sun. Contrary to popular belief, no , the sun does not directly pull the planets around with gravity. Rather, it was caused by the curvature of space-time fabric . Have a look at the diagram below to get the idea.

space (pic credit: nasa.gov)

Planets move around the sun based on the curve formed by the sun. Basically, the sun keeps ‘spiraling’ to create this effect. It is a pretty similar situation when you use a teaspoon to stir your cup of coffee. Put some small ice-cubes in to cup, gently stir the drink and you will see the effect right under your nose. This is the phenomenon which causes earth together with other planets to constantly stay within the orbit, not moving away from sun and obediently orbiting around it.

Notice that the satellite in the image is shooting a beam towards the earth. What it tried to depict here is that even light and radio-wave movements are influenced by the space curvature. They have to move along it.

Now another question. What caused the planet to keep orbiting and moving on and on eternally? What caused the sun to keep on rotating eternally hence creating the spiral effect? I will answer that in the next post.

Written by elan85

November 16, 2007 at 6:44 pm

Posted in Astrophysics