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Time Travel Again !

Davide Writes: (The email is posted as such. SO, sorry for the telegraphic language and poor spelling and grammar)

“Hello there i have one more question,a crazy one:) according to Einstein we need a enormous amount of energy to push matter at a speed of light,now for me the real problem there  is that an atoms at a speed of light will break a part right?so even if we will find a way to push it,we will still failed.I was wander are we looking to the right way?is it photon, so the world of small with no mass only work? now here my crazy question,lets speculate a bit,we have two red dwarf pretty close to earth Barnard’s Star” only  “5.9 ly and Wolf 359 7.7ly a baby step compere the universe,if we can send a same kind of mission the we have done with Stardust Nasa’s comet sample and collect a piece the size of a soccer ball back to earth,we could work on it outside earth atmosphere in the space base.Since we can’t go in the first place at a speed of light let’s says that the all deal will last 150 year to go and back,(assuming that we use a new energy to go bit faster)in the mean time the space base will be pretty developed and maybe we even found a new power to push to the speed of light(i remind you that we are speculate)we could put our hands on the sample using electromagnetism so that we avoid any risks and then send it at a seed of light.What i try to say is that a single atom is weak but billions of it together is a different story,here an example, lets imagine to make a spherical shape out of Lego(the toy) and send it in to space at a great speed,it will break pretty soon,now we make another one but we glue the piece together,it will last bit longer,again another with glue and a put net around it will last even longer so instead of a Lego we use our sample,the glue in the inside is the immense mass that will have (piece of red dwarf) net outside the  immense gravitational pull ,now do you think that it will be enough to keep it together at a speed of light?regardless the energy that we need to push it?  after all even in the past we believed that going faster than a  speed of sound a plane will brake a part or something bad could happen,instead only a big BUM wen we reach it and nothing more,so maybe if we can go faster than light nothing will happen,or maybe we find a new way to travel,we can even give a name for fun “a speed of matter” what do you think about it?i know it sound like sci fi but hey physics it self is blowing mind science right?   Thank you kindly for your time:)”

I don’t like to respond now.

Responses from visitors invited

Will the orbits of planets in the solar system change or will it be the same forever?

Sreeda asks:

Will the orbits of planets in the solar system change or will it be the same forever?

Answer:

The orbits change over time.

More details To be posted soon

Time Stops ?!!

Davide Asks again:

“i have one question about time. Once professor Stephen Hawking said that if hypothetically a man stand in font of a black hole the time will stop for him.Now we all know how time works because we understated time we have study it but dose our body understand it?what i mean is if time will stop for me will my body stop as well is natural course?(getting hold,cellular production etc)i don’t think so right?so what the connection between time and body if exist one?and why scientist always speak about time stopping  only and not    include in the argument human body as well?after all according to Einstein the past,present,future are already there,we only walk through it and since we are  interacting with it as  a living been   time, space and us  are lock together .So standing in front of a black hole, if time stops without effecting my body ,time stop in relation to what?  Thank you kindly for your TIME:)”

(The post is not corrected for grammar and spelling)

Response from visitors invited

Elliptical Orbits

Sreeda asks:

  1. Why do planets move in elliptical paths and not in circular ones?

Answer:

Ellipse is a more general shape than a circle. Circle is a special case of ellipse when its semimajor axis and the semiminor axis are of equal lengths.

The shape of orbit depends on various factors.

Johannes Kepler in the 1600s was the first to start discussing the shape of planetary orbits, formulating a series of laws to explain their shape and characteristics. Isaac Newton and Albert Einstein contributed additional research and theories.

Shape of a planet’s orbit is affected by the gravitational force of sun as well as other planets.

Also Remember that the sun is also in motion, which makes elliptical orbit an easy one than a perfectly circular one.

[Comments solicited from esteemed visitors]

BMMD – Body Mass Measuring Device

Priyanka asked

What is a BMMD? How does it work?

Ans:

BMMD stands for Body Mass Measuring Device used by astronauts, which is basically a spring mounted chair which measures mass as a measure of inertia. As you know, one experiences weightlessness inside a satellite and normal methods of measuring mass do not work. (like a common balance or a spring balance). The time period of oscillations which depends on the force constant and mass is used in measuring mass in BMMD used by an astronomer

why earth moves in an elliptical orbit instead of circular one?

Zeenath PV asked:

why earth moves in an elliptical orbit instead of circular one?

Ans:

image Please note that ELLIPSE is the more general form for an orbit and CIRCLE is a speacial case of ellipse.

So, it is more general way of saying that the orbits are elliptical. If it were circular, we would have more trouble explaining why they are perfect circles.

The situation where the Sun, for instance, would be exactly in the center of a perfectly circular planetary orbit couldn’t happen in our Solar System since there are other planets that would gravitationally affect the orbit and cause it to be immediately non-circular by pulling the object to one side or the other.  Any other stable orbit type than a perfectly circular one turns out to be an elliptical orbit.

Read more at : http://www.astro-tom.com/technical_data/why_elliptical.htm

How earths tilt causes seasonal change?

Zeenath PV asked: how earths tilt causes seasonal change?

Answer:

image The climate on earth is mainly determined by the distance from sun and how much sunlight (and heat radiations) is received by earth. The relative duration of day and night as well as the climate is greatly dependant on the tilt of the earth’s axis with respect to its plane of orbit around sun and the elliptical shape of earth

Please follow these links to read more:

  1. http://www.msnbc.msn.com/id/3077384/
  2. http://en.wikipedia.org/wiki/Season
  3. http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/980211f.html
  4. http://www.eoearth.org/article/Causes_of_climate_change
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