Monday, 5 December 2011
Sunday, 4 December 2011
THE SUN- The Sun is a globe of gas, mostly hydrogen, measuring 1,392 thousand kilometres across, over a hundred times the diameter of the the Earth. It is the centre of the Solar System and gives the Earth and other planets light and heat.
MERCURY- Mercury is the first planet from the Sun. It is a small and rocky planet.
VENUS- Venus attains the greatest brilliance in the night sky, outshining all the stars, hence its poetic names 'morning/evening star'.There are no natural satellites of this planet.
EARTH- It is the planet which we live. It is a huge ball whose surface is two-thirds water and one-third land. It is surrounded by layers of air known as atmosphere.
MARS- Mars is the fourth planet from the Sun, the outermost of the terrestrial- type planets, with an eccentric orbit at a mean distance of 228 million km.
JUPITER- Jupiter is the largest planet. It is so large that a thousand Earths could fit inside it. But it spins so fast that its day is less than 10 hours long.
SATURN- Used to be known as the planet with 'the rings'. Ring system have now been discovered around its three neighbouring planets but Saturn's rings are by far and brightest.
URANUS- Uranus is surrounded by a thick atmosphere of helium, hydrogen an methane. But unlike the other 'cloudy' planets it has hardly any cloud markings.
NEPTUNE- Neptune is discovered by German astronomers in 1846, the blue colour of Neptune is due to the presence of methane.
PLUTO- the smallest planet. Pluto is named after Greek God of the underworld. It is the only planet in the Solar System which has not been visited by a spacecraft.
Saturday, 8 October 2011
WOW! 5 UNBELIEVABLE FACTS
There is still so little known about outer space by modern science, but of that little we do know, there are some extraordinarily amazing things. This is a list of the top 5 cool facts about Space.
Fact: If you put Saturn in water it would float
The density of Saturn is so low that if you were to put it in a giant glass of water it would float. The actual density of Saturn is 0.687 g/cm3 while the density of water is 0.998 g/cm3. At the equator Saturn has a radius of 60,268 ± 4 km – which means you would need an extremely large glass of water to test this out.
4. Constantly Moving
Fact: We are moving through space at the rate of 530km a second
Our Galaxy – the Milky Way is spinning at a rate of 225 kilometers per second. In addition, the galaxy is travelling through space at the rate of 305 kilometers per second. This means that we are traveling at a total speed of 530 kilometers (330 miles) per second. That means that in one minute you are about 19 thousand kilometers away from where you were. Scientists do not all agree on the speed with which the Milky Way is travelling – estimates range from 130 – 1,000 km/s. It should be said that Einstein’s theory of relativity, the velocity of any object through space is not meaningful.
3. Farewell old friend!
Fact: The moon is drifting away from Earth
Every year the moon moves about 3.8cm further away from the Earth. This is caused by tidal effects. Consequently, the earth is slowing in rotation by about 0.002 seconds per day per century. Scientists do not know how the moon was created, but the generally accepted theory suggests that a large Mars sized object hit the earth causing the Moon to splinter off.
2. Ancient Light
Fact: The light hitting the earth right now is 30 thousand years old
The energy in the sunlight we see today started out in the core of the Sun 30,000 years ago – it spent most of this time passing through the dense atoms that make the sun and just 8 minutes to reach us once it had left the Sun! The temperature at the core of the sun is 13,600,000 kelvins. All of the energy produced by fusion in the core must travel through many successive layers to the solar photosphere before it escapes into space as sunlight or kinetic energy of particles.
1. Solar Diet
Fact: The Sun loses up to a billion kilograms a second due to solar winds
Solar winds are charged particles that are ejected from the upper surface of the sun due to the high temperature of the corona and the high kinetic energy particles gain through a process that is not well understood at this time. Also, did you know that 1 pinhead of the sun’s energy is enough to kill a person at a distance of 160 kilometers? [Sourced from Planet Science]
Tuesday, 27 September 2011
Stars are the shining globes of gas. Their heat comes from deep inside, where hydroyen is turned into helium, giving out nuclear energ. When the hydrogen present in a star is exhausted, it eventually dies.Galaxies are the assembly of millions of starts.
Sunday, 25 September 2011
Saturday, 24 September 2011
There are more stars in the Universe than there are grains of sands on all the beaches in the world. The Universe is so vast that a ray of light travelling from a remote part of Outer Space takes millions of yeras to reach the Earth. So, when astronomers abserve the most distant galaxies, they see them as they were when they were formed, millions and millions of years ago- only one billion years after the birth of the Universe itself. Radio -telescope are used to study these galaxies, and the further away they are, the further back we look in time.