Bharat Rakshak

Amber G.

The Moon View Last week, NASA released a newly restored image of a younger Earth. It was taken from Lunar Orbiter 1 in 1966, the first of several orbiters that helped gather data for the first moon landing in 1969. The photograph shows Earth just cresting the Moon’s curving horizon, the first pictu...

Amber G.

Amber My point is the ~same orbital plane and spin is more likely if the sun, planets and sats "coformed" rather than thru impacts. Just to add - "conformed" is consistent with - that during billions of years after the initial formation- there are collision and new bodies are fo...

Amber G.

Does the impact theory explain -why moon's orbital plane around earth is more or less same as earth's orbital plane around sun ....coincidence? -why moons spin direction is same as earths spin direction? Actually virtually all planets (with possible exception of Pluto) and their satellites (and com...

Amber G.

A quick question for you... When an object is spinning, isn't there a Centripetal force acting on that object too, which pulls even loose objects to the center of the spinning object. This would in effect dislodge the theory of a part of the earth breaking off on its own. Probably a good book would...

Amber G.

To add to the above: The Fission hypothesis about part of earth being broken off (say due to centrifugal force) is not given much credence now (primarily because if one calculates, one can not explain the angular momentum quantitatively ). (BTW, "capture" hypothesis as well as "double...

Amber G.

RB - hmm..funny you should mention Saha's name. He had an even stronger link to my grandfather (he was his PhD advisor!...in fact when Meghnad Saha suddenly passed away...my grandfather refused to submit his dissertation out of respect and in fact never got his PhD though people who knew about the i...

Amber G.

wonderphool onlee to have my family name assigned to crater! :mrgreen: Satyen Bose was my grandfather's teacher and my mother still remembers meeting him as a kid, as being a man with a very deep gravelly voice and serious demeanor. I think ISRO should name a feature (which allows non-deceased name...

Amber G.

If someone have suggestions for name, I suggest (and I am sure it is being done) that they contact ISRO. etc.. The policy for naming for any of the moon’s feature is: Large craters: Famous deceased scientists, scholars and artists; Small craters: Common first names. Catenae, Dorsa, Rimae: : Feature ...

Amber G.

O/T but Sumishi - NO, its not me. As I said, it is someone who I know..very well ... (Sorry for obvious privacy reasons no speculations etc, (Harbans your info is about a different minor planet (It is not ref # 21431) .. (If you are looking at the alphabetical list of minor planets, see the name jus...

Amber G.

I would suggest that the point at which MIP struck the moon should be named after Dr.Kalam like " Kalam Point " AFAIK - there are some guide lines for naming, but generally "Discoverer" proposes a name, and it becomes recognized (official) if approved by IAU. (Normally any polit...

Amber G.

wow!~... we should name this bright crater after some Indian name. They do it, before us.. we should start naming objects we see in moon. come on folks help here..How about calling it "Anuraj!" Crater ? No doubt features would be named as such. Traditionally moon craters are/were named af...

Amber G.

Since no one has used these words here yet.. let me put them:

Jhanda ooncha rahe hamara
Vijayee chandra tiranga pyara!

On a lighter side: I think some see this opportunity
ACall center on moon

Amber G.

All - Great pictures. Thanks. Shalav – Please read my post, and many (including some scientists) make mistake here, but the figure has NO "corkscrew" or even "waves" as you pointed out. The orbit at every point is convex. (This is true, of course for earth/moon system , and not a...

Amber G.

SSSalvi and others - thanks.

Amber G.

S^2 - Thanks, I understand that. (BTW - Oblateness of earth is one which causes precession of moon's orbit (with a time period of about 18 years) - ( (I learned that when I learned about rahu and ketu :) ) I also understand situation is different for moon, but my point was.. Moon also has "obla...

Amber G.

Unfortunately, we cannot have a sun-synchronous polar orbit of the moon as we have with the earth. SSridhar - can you expand on this a little. (why one can't have ?) (I can do some checking, but if you have a link, or explain it further with some details) Thanks in advance. (Also, why would one wan...

Amber G.

Few Items: Few Items: Shalav: A corkscrew line wrapped around the Earths orbit depicting the moons orbit as it circles the Earths orbit. No, if I understand you correctly this is not correct. Please read my post, and many (including some scientists) make mistake here, but the figure has NO "cor...

Amber G.

The effective ground speed of CY1 (wrt the Moon surface) is about 1550 m/sec - obviously a pretty high velocity

Effective ground speed would be around the order of 70-80 m/s.

Amber G.

The problem is that the Moon has a more complex motion than the Earth ( orbiting both Earth and Surya) FWIW - Don't know exactly what one means by "more complex motion" but both earth and moon orbit around the sun in a more or less an elliptical, orbit (with nearly same "e" and ...

Amber G.

For those who are curious, Here are the 13. Akaka (D-HI) Bingaman (D-NM) Boxer (D-CA) Brown (D-OH) Byrd (D-WV) Conrad (D-ND) Dorgan (D-ND) Feingold (D-WI) Harkin (D-IA) Leahy (D-VT) Reed (D-RI) Sanders (I-VT) Whitehouse (D-RI) Was a little disappointed from one of (OH) senator, I did not vote for hi...

Amber G.

N - No, amendment is resoundingly defeated.
For bill proper yes about 85+ (If I can count the yea correctly)
Boxer and about 9 other gang member are no..
(Both McCain and Obama - Yes)
Passes (86 to 13).

Amber G.

narayanan wrote:Is there any url to track this process live / near real-time?

Of course, near real time - or pre-realtime there is also BRF.

Vote results:
Amendment - NO (is nixed)
Bill passes.

Amber G.

Few more hours to wait for the vote, but looks like it will pass in senate.

Amber G.

Huge new prime number discovered (BBC) The search for new high prime number continues Mathematicians in California could be in line for a $100,000 prize (£54,000) for finding a new prime number which has 13 million digits. As said before, (see post a few message above and one on August 26) - breaki...

Amber G.

Consider an equilateral triangle of height 'h'. Take any point P inside the triangle. Drop ppendiculars PA, PB and PC to each of the three sides. Show that PA + PB + PC =h Sorry could not resist it: Area of a given triangle (or Volume of a tetrahedron, for that matter) is constant (that is , it doe...

Amber G.

Rumor is that a new "largest known prime" (mersenne prime number) number is found.. wait for a few days (about 2 weeks will be needed for it to be rechecked) till it gets checked out, and if so verified , it might hit the news.. Last largest know prime number discovered in 2006 was 2^3258...

Amber G.

Just to add to the above,
A very easy similar looking question to be tried:
Find one solution for (a^3+b^4=c^5) (a,b,c are positive integers)

(See how long does it take...

Amber G.

FWIW: Here is my outline of the solution for 3^x+4^y=5^z problem: (x,y,z are ntegers) Case 1 x<0 Easy to see both y and z has to be negative. (why? – because for non—negative y (or z) 4^y is integer etc) In that case, putting a=-x,b=-y,c=-z (a,b,c >0) 1/3^a + 1/4^ b = 1/5^c ==> 5^c(3^a+4^b) = (3^a )...

Amber G.

SKM - As said before, for horses race, 7 races are enough(see the earlier message) in all cases to get top 3 horses.

Amber G.

V - In 7 races, you can always find the top three. (Let the horses be named A1,A2, ..A5, B1,...B5 ...E1,..E5 such that) wlog (Assuming X1>X2>X3>X4>X5 for say X=A,B,C,D,E) 5 races Assume A1>B1>C1>D1>E1 (Sixth race) Run (A2,A3,B1,B2,C1) (7th race) top 2 from here (in right order) along with A1 as on t...

Amber G.

Another 2 probability problems - Not hard but may be a little different than run of the mill - 1. A fair coin is tossed until either 5 heads come consecutively or 3 tails come consecutively . (You keep throwing the coin till one of the above two happens). What is probability that 5 heads (consecutiv...

Amber G.

Speaking about Bose, a funny anecdote (as told by his student, in a not-that-old issue of Physics today) When Dirac (Famous Noble prize winning physicist - antimatter / Fermi-Dirac Statistics) was visiting Calcutta, after his lecture they got in a car for a drive to hotel. Prof Dirac and His wife go...

Amber G.

To add to Vipul's post - x post from Nukkad:
The LHC is ON!
Check out this picture
The leader of CMS experiment guy is Indian origin - T. Virdee.

Amber G.

Number theory is cool .. but just to change flavor, here is a (hopefully simple)problem in probability.

X throws a fair coin 50 times, Y throws a fair coin 51 times, what is the probability that Y will throw more heads than X?

Amber G.

Najunamar - with respect to 3^x+4^y=5^z, yep, the step, to show, no solutions for 3^n-1=2^m, for n>2 is critical. BTW one can just check modulo 8 (LHS can only be 2 or 4 - (because 3^2==1 mod 8 ) while for n>2 rhs is 0 mod 8 ) With respect to x^3-y^2=2, I noticed, the typo, but knew you will find it...

Amber G.

This is a great day for India, all of India. This also shows that the Americans are really the sole superpower. Also, BJP must now keep their traps quiet and focus on the elections, if their real intent was to keep MMS "honest." The fact is that MMS laid it on the line and came through, f...

Amber G.

Sorry but one more time, :) hope fully the last time (seem to be repeating the same) For every term that is 2 mod 4, there exists at least 1 odd factor, see all integers that are 2 mod 4, +/- 6, +/- 10, ....to +/- infinitiy; hence unless it is +/- 2 the RHS possesses odd factors hence no solution ca...

Amber G.

Here's some more intermediary steps. On the RHS if you take n even then first term is 2 mod 4 and second is 0 mod 4, if you take n is odd then reverse is true (first term 0 mod 4 and second is 2 mod 4). Since any multiple of 2 other than 2*4^k where k = 0,1,.... would leave such a residue of 2 iff ...

Amber G.

Here's one solution. First using mod 3 on both sides, Find z is even (for nonzero x).Then taking mod 4 on both sides we find x is even. Next, we use x=2m and z=2n, we get 4^z = 5^2n -3^ 2m further simplified to 4^z = (5^n - 3^m)(5^n +3^m) We find for the RHS one term is 2 mod 4 and the other is 0 m...

Amber G.

Few points. With respect to 1001, ..A relative unknown method to test divisibility by 7,11, and 13 involves this. To check divisibility by 2 (check the last digit), by 3 (sum all the digits and see if that is a multiple of 3), and by 5 (last digit is 0 or 5) is well known. Also one can check easily ...

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