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


MOON – A Brief Introduction

The earth has only one natural satellite called moon. It is also called dead satellite.
Moon’s gravity is just 1/6 of earth’s gravity. It is only 1.62m/s².

A large size terrestrial body collide with earth 4.53 billion years ago and a large piece of earth is separate and revolve in orbit around earth. Now that large piece is our moon.

Due to moon’s less gravity, there is no atmosphere on the moon because the escape velocity of atmospheric particle is greater than the escape velocity of moon and due to this the atmospheric particle escape out of moon’s gravitational pull.

Moon’s escape velocity is only 2.38km/sec while earth’ escape velocity is 11.19km/sec.

Moon complete one revolution of earth in just 29.4 days While earth can complete one revolution of sun in 365.25 days.
Moon can complete one revoution on its axis in 27.3 days.

Earth’s one day time 23 hours and 56 minutes. This is the cause of leap year.

According to some theories if moon does not exist then earth’s day time would be approximately 6 to 10 hours. So moon increase earth’s day time.

Moon’ gravity cause tides in sea.

Thousands of asteroid and comets was collides with moon’s surface and cause craters on its surface. You can see these craters from earth by telescope.

The first living animal land on the moon surface was a dog name Laika on 3 November 1957.
And The man who took the first steps on the moon’s surface on july 20, 1969, was named Neil Armstrong .

Neil Armstrong and aldrin walked on surface of the moon.

Radius of the moon is approximately 1,738 km Earth to moon distance is 384400kms.
Light can take 1.2 second to reach the moon from earth.





Earth – the blue planet

Earth is a Germanic word, and it means “the ground“, and it is at least 1000 years old . but all of the planets were named on greek and roman god and goddess (except earth).

Earth is about 4.5 billion years old and third planet from sun.

you could be spinning through space at just over 1,000 miles per hour.

Earth have different seasons because  Earth is tilted 23.4 degrees on its ‘axis.

The Earth’s diameter is about 12,800km.

Earth’s Core Is as Hot as the Sun’s Surface.

We live on the earth ,not in the earth.

About 70% of the Earth’s Surface is Covered in Water. Earth have only 3% fresh water and other 97% of it is salted.

About 100 lightning bolts strike earth every second.

About 5000 people dies due to drinking polluted water and about 100 million mammals dies by pollutionon earth.

Currently earth has about 3 trillion trees.

The earth’s population is about 7.6 to 7.8 billion.

many claims states that Nicolaus Copernicus was the man who discovered earth.




The sun is a star, a hot ball of glowing gases at the heart of our solar system. It is the largest object and contains approximately 98% of the total solar system mass.

Its gravity holds the solar system together, keeping everything from the biggest planets to the smallest particles of debris in its orbit. 

The Sun’s outer visible layer is called the photosphere and has a temperature of 6,000°C (11,000°F). 

the sun’s visible surface sometimes has dark sunspots, which are areas of intense magnetic activity that can lead to solar explosion.

The Sun’s period of rotation at the surface varies from approximately 25 days at the equator to 36 days at the poles. Deep down, below the convective zone, everything appears to rotate with a period of 27 days

Solar energy is created deep within the core of the Sun. It is here that the temperature (15,000,000° C; 27,000,000° F) and pressure (340 billion times Earth’s air pressure at sea level) is so intense that nuclear reactions take place

The connection and interactions between the Sun and Earth drive the seasons, ocean currents, weather, climate, radiation belts and aurorae. Though it is special to us, there are billions of stars like our Sun scattered across the Milky Way galaxy.

Average diameter: 864,000 miles, about 109 times the size of the Earth.

Mass: 1.989e+30

Rotation period at equator: About 27 days.

Rotation period at poles: About 36 days.

mean density: 1.410 (gm/cm^3)

Surface temperature: 10,000 degrees Fahrenheit.

Composition: Hydrogen, helium, Oxygen, nitrogen, carbon, neon, iron, silicon, magnesium, sulfur etc

to be continue……