Sunlight

30th November 2016

Sunlight: World’s most ancient traveller

Sun, the pivotal element of the solar system, is a middle-aged star that is around 4.6 billion years old. This near-perfect sphere is made up of 70 per cent hydrogen and 28 per cent helium. With the amount of hydrogen left on it, it can survive for another 5 billion years. In the last stages of its life, it will begin burning helium. In this phase, the sun will grow in size and eventually consume Mercury, Venus, and Earth, till its collapse. Although the mass of the sun will remain the same after the collapse, its volume will reduce to about the earth’s current volume.

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6th May 2016

What makes the national flag of Paraguay special?

The national flag of Paraguay has different emblems on the obverse and reverse sides. The flag has an emblem on the obverse side, which is the national coat of arms of Paraguay that comprises a yellow five-pointed star surrounded by a green wreath capped by the words REPUBLICA DEL PARAGUAY. The emblem on the reverse side is the seal of the treasury, which is a yellow lion below a red Phrygian cap and the words PAZ Y JUSTICIA (‘Peace and Justice’).

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16th February 2016

What is a neutron star?

A neutron star is a remnant of a star after it has collapsed due to its own gravity. These stars are composed of subatomic particles called neutrons without any electrical charge. These stars could be two times the mass of the sun. The neutron stars have a very high surface gravity which could be 2 × 1011 times more than the gravity on the surface of the earth. A neutron star is very dense. It is so dense that one teaspoon (5 millilitres) of its material would have a mass over 5.5 × 1012  kg.

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8th February 2016

How much space dust falls on the earth every day?

Space scientists estimate that daily about 40 tons of cosmic or space dust falls on earth. They are studying this dust by collecting them using high-altitude aircraft and satellites. The origin of this dust is not clear. However, it is speculated that in space the asteroids, meteors and comets collide, thus producing dust.

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