Look at this 360 panorama of Mars by Curiosity:

http://www.360cities.net/image/curiosity-mars

binry destruction

This is inter_activity which should be done in a blog. I will ask a problem, we will discuss, and then solve it.

This one interested me so here it is:

A. The star Sirius (the brightest star in the sky) has a white dwarf companion. Sirius has a mass of about
     2  Msun and it is still on the main sequence, while its companion is already a star corpse. Remember that                  
     a white dwarf cant have a mass greater  than 1.4 Msun. (Chandrasekhar limit http://en.wikipedia.org/wiki/Subrahmanyan_Chandrasekhar ). Assuming that they both formed on the same
     time have a group discuss how Sirius could have a white dwarf companion. HINT: Was the initial mass of                                               the white dwarf star more or lesser than Sirius?

1

1

2a

2b

2c

The World From The Eyes of Muhammad Shaheer Niazi: Hi ,I am Muhammad Shaheer Niazi ,welcome to my blo...

The World From The Eyes of Muhammad Shaheer Niazi: Hi ,I am Muhammad Shaheer Niazi ,welcome to my blo...: Hi ,I am Muhammad Shaheer Niazi ,welcome to my blog. I am 12 years old ,my interests are astronomy ,Maths ,physics ,history ,biology and ch...

NASA new finds on galaxies formation

Simulations such as this will help astronomers better understand the new findings in galaxy evolution. It tracks the development of a single disk galaxy from shortly after the Big Bang to the present day. Colors reveal old stars (red), young stars (white and bright blue) and the distribution of gas density (pale blue);

credit NASA

for more info to continued answer go here 

http://forums.udacity.com/ph100/questions/9173/

my-own-gravity-at-10cm-away-from-me-hehehe-and-

now-black-holes-gravity-to-test-if-light-can-e

scape-one-or-not-and-again-some-more-11-questions-

for-help-in-the-black-hole-question

**Q4. Say a white dwarf has a mass of the sun but the radius of earth.

 What is the surface gravity of it? How much will you weigh on it??**

so:

  

mass = 1.98x10^30 kg

radius = 6.4x10^6

gravitational constant = 6.67x10^-11 Nm/kg^2

a = (G x m)/r^2

= (6.67x10^-11 x 1.98x10^30) / 6.4x10^6^2

= 3224267.5 m/s^2

we will wheigh:

m=40kg

a = 3.22x10^6 m/s^2

             

f=ma

=40 x 3.22x10^6

=1.28x10^8 N !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

The python version

               Q.1

    import math

       def cosmic_gravities(mass,radius,constant):
           G = 6.67e-11
           if constant != G:
               return "INCORRECT, >:)"
           formula1 = (constant * mass)
           formula2 = (radius)**2
           main = formula1 / formula2
          if constant == G:
              return "YOU GOT IT RIGHT ,correct", main
Q.2

           def race_with_light_or_a_fly(acceleration,s_light):
               light = 300000000 #m/s
               if s_light>acceleration:
                   return "Zap, Ill never let you go you fake programmer!", "P.S its
light and no"
               one _meter = 1.057e-16 #LY
               if s_light<acceleration:
                   return "yoyoyoyoyoyo!!!!, light loves you, you and light are going in blackhole"

     print cosmic_gravities(40,0.1,6.67e-11)

     print cosmic_gravities(1.99e3,5,6.67e-11)
     print cosmic_gravities(11212,787,9e-11)

    light = 300000000

     print race_with_light_or_a_fly(5.7e6,light)
     print race_with_light_or_a_fly(5.7e9,light)
Q.3

       def escape_velocity(constant, mass, radius):
           con = 6.67e-11 #Nm/kg
           formulae = (2*constant*mass)/radius
           if constant == con:
               return "I wanna move it move it , correct", math.sqrt(formulae)/1000
           if constant != con:
               return "Im falling, im going down, incorrect", False

G = 6.67e-11
print escape_velocity(6.67e-11,79997977979,0.009)
print escape_velocity(6.67e-11,5.34e24,6.4e6)
print escape_velocity(7e8,5555,55555)

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The World From The Eyes of Muhammad Shaheer Niazi: My solutions to the Questions written in the book ...

The World From The Eyes of Muhammad Shaheer Niazi: My solutions to the Questions written in the book ...: This I have done for more help in the black hole question:: How much would you weigh on a stellar corpse? Lets calculate what is it rea...