BLACK HOLE – An unsolved mystery

Firstly Blackhole is not is hole.
It is a neutron star.

A Black hole formed when a star dies. The dead star firstly expand due to supernova and then squeeze or contract toward its core due to its high gravitational pull.
Due to this high contraction the electrons of atoms come near to protons in nucleus and become neutral. So that it is called neutron star.

This information is based on some famous theories.
According to some theories the size of a black hole can be as small as just one atom and big as 75 billion miles in diameter.

Currently the smallest known black hole is only 20 km in diameter and have mass equivalent approximetely 3.4 solarmass.
(1 solarmass= 1.8×10³⁰kg).

One teaspoonfull of black hole matter has equivalent mass of one earth. Because it is so dense.

The spin of black hole on its axis is nearly 3000 times faster then earth.
The inside temperature of black hole is very low about 1/10¹⁴kelvin while the outside temperature is very high.

The gravitational pull of black hole is very high. So it bends the space. Due to this bend in space, even light can not pass through a black hole (because light has the property to the travel in straight line).

Anything can never be fall in black hole directly. Due to black hole’s high spin, the object that fall in black hole rotate with a very high speed around it.

Even everything not fall in the black hole because due to high spin, and because of this the centrifugal force increases.
Due to increment in centrifugal force some mass can escape the gravitational pull of black hole.

If anything falls in blackhole, the body rotating and start to stretch toward its surface.
The body Stretch because gravity attract it toward the surface and high spin and high centrifugal force oppose this attraction. So both the phenomena of moving and attracting occur at same time and then the body get stretched.
Because of these phenomena, the form of body changes and it cannot remain stable.

If you fall into a blackhole, the time moves slowly for you due to bend in the space.

Mostly every galaxies has black hole in middle. Our galaxy(the milky way) also has a giant black hole in its middle.

Black holes cannot be observe or seen directly because they are black. They are observed by the radiation and stars moving around them.

Nearest found black hole to our solar system is HR 6819 and it is only 1000 light year away.
(Light year is the distance that travelled by light in one year with speed 3 lakh km/sec).

To come out from a black hole as impossible as to climbing on a waterfall from bottom to top by a boat.

to be continue……..


If you find any errors in any of our posts, you can contact us



Current is a flow of electric charge carriers , usually electrons or electron deficient atoms.

the common symbol for current is the uppercase letter I

S.I. unit is ampere

electric current can either be direct or alternating current, means DC or AC


an electric current that reverses its direction many times a second at regular intervals, typically used in power supplies.

AC current can be produced by rotating a coil of wire in magnetic field.


An electric current flowing in one direction only.

a battery is a prime example of DC power

direct current may flow through a conductor such as a wire but can also flow through semiconductors, insulators, or even through a vacuum as in electron or ion beams.

to be continue….

this is brief introduction about electric current, we’ll update more information soon.



AGES & STAGES – prenatal to adult

Prenatal – before birth

Newborn – 0 to 2 months

Infant – 2 month to 1 year

Toddler – 1 year to 3 year

Preschooler – 3 to 6 year

Child – 6 to 9 year

Tween – 9 to 12 year

Teen – 13 to 19 year

Adolescence – 19 to 21 year

Adult – 21 – 39 year

Middle adulthood – 39 to 65 years

Late adulthood – 65 years

hope u like it




list of some famous countries and their currencies


  1. Afghanistan – Afghan afghani
  2. Algeria – Dinar
  3. Argentina – Peso
  4. Australia – Australian dollar
  5. Bahrain – Bahrain dinar
  6. Bangladesh – Taka
  7. Belgium – European Euro
  8. Bhutan – Ngultrum
  9. Brazil – Real
  10. Bulgaria – Lev
  11. Cambodia – Riel
  12. Canada – Canadian dollar
  13. Central African Republic – CFA Franc
  14. Chile – Chilean Peso
  15. Colombia – Colombian Peso
  16. Costa Rica – Colón
  17. Cuba – Cuban Peso
  18. Denmark – Danish Krone
  19. Dominican Republic – Dominican Peso
  20. Egypt – Egyptian pound
  21. Ethiopia – Birr
  22. Finland – markka
  23. France – French franc
  24. Georgia – Lari
  25. Germany – Deutsche mark
  26. Ghana – Cedi
  27. Greece – drachma
  28. Hungary – Forint
  29. Iceland – Icelandic króna
  30. India – Indian Rupee
  31. Indonesia – Rupiah
  32. Iran – Rial
  33. Iraq – Iraqi Dinar
  34. Ireland – european euro
  35. Israel – Shekel
  36. Italy – lira
  37. Jamaica – Jamaican dollar
  38. Japan – Yen
  39. Jordan – Jordanian dinar
  40. Kazakhstan – Tenge
  41. Kenya – Kenya shilling
  42. Korea – Won
  43. Kuwait – Kuwaiti Dollar
  44. Liberia – Liberian dollar
  45. Malaysia – Ringgit
  46. Maldives – Rufiyaa
  47. Malta – Euro
  48. Mauritius – Mauritian rupee
  49. Mexico – Mexican peso
  50. Myanmar – kyat
  51. Nepal – Nepalese rupee
  52. Netherlands – guilder
  53. Nigeria – Naira
  54. Norway – Norwegian krone
  55. Oman – Omani rial
  56. Pakistan – Pakistani rupee
  57. Peru – Peruvian sol
  58. Philippines – Peso
  59. Poland – Zloty
  60. Portugal – Euro
  61. Qatar – Qatari riyal
  62. Romania – Romanian leu
  63. Russia – ruble
  64. Saudi Arabia – riyal
  65. Serbia – Serbian Dinar
  66. Singapore – singapore dollar
  67. South Africa – rand
  68. Spain – peseta
  69. Sri Lanka -Sri Lankan rupee
  70. Sudan – Sudanese Pound
  71. Sweden -Krona
  72. Switzerland – Swiss franc
  73. Syria – Syrian pound
  74. Tajikistan – somoni
  75. Thailand -Baht
  76. Turkey – Turkish lira
  77. Uganda – Ugandan new shilling
  78. Ukraine – Hryvnia
  79. United Arab Emirates – U.A.E. Dirham
  80. United Kingdom – pound
  81. United States of America – dollar
  82. Venezuela – Bolivar
  83. Vietnam – dong
  84. Zimbabwe – United States dollar




ISRO – pride of our nation

here is a some information about ISRO (Indian space research organization)


Indian national committee for space research (INCOSPAR) was setup by the government of India in 1962. With the visionary Dr. Vikram Sarabhai. Isro headquartered in Bangalore for the purpose of rapid development of space technology and its application.


Modern space research in india in most visibly traced to the 1920s .when the scientist s.k. mitra conducted a series of experiment leading to the sounding of the ionosphere by application of ground based radio method.
APJ Abdul kalam ,Dr.K Radhakrishnan had given their great contribution in the direction and success of ISRO.


Aryabhatta is India’s first was the spacecraft to be entirely built in the country making a breakthrough in the space mission.Leadership of APJ Abdul Kalam , the satellite launch vehicle(SLV) project was initiated. The aim of this project was to develop the necessary technology to launch satellites.
In 2008 Chandrayaan, county first unmanned lunar probe was launched by ISRO.
ISRO in 2016 also launched indian regional navigation satellite system for marine navigation ,vehicle tracking disaster management.


Space research was further encouraged by the technically inclined Prime Minister of India, Jawaharlal Nehru .In 1957 the Soviet Union launched Sputnik 1 and opened up possibilities for the rest of the world to conduct a space launch.
The Indian National Committee for Space Research(INCOSPAR) was set up in 1962 by Jawaharlal Nehru, first Prime Minister of the India.
Indian Space Research organization(ISRO),set up at Ahmadabad in 1969 by the Prof. Vikram Sarabhai as chairman.