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Sun is the closest star to Earth.
Sirus is a binary star and the brightest star in the night sky.
Rigel is is on average the seventh-brightest star in the night sky and the brightest in the constellation of Orion.
Deneb is the brightest star in the constellation of Cygnus, the swan.

Most Mercurian craters are named after famous writers, artists and composers.

Hydrogen as a fuel in Sun. The source of Sun’s incessant energy is hydrogen which is continuously converting to helium through nuclear fusion reaction releasing energy.
Nuclear fusion is the type of nuclear reaction taking place in the sun.In nuclear fusion, two or more atomic nuclei are combined to form one or more different atomic nuclei and subatomic particles.
Here the hydrogen atoms combined to form helium and heat is liberated during this process,hence hydrogen is known as nuclear fuel in the sun.

This is the reason why we see the same side of the moon always.

Saturn is the sixth planet from the Sun and the second-largest in the Solar System, after Jupiter.
82 moons are known to orbit Saturn, Saturn holds the record for having the most moons in the Solar System.

The inequality between day and night becomes greater or more marked as one travels from equator to the poles

Quartz is the second most abundant mineral in Earth’s continental crust, behind feldspar.
Quartz is a most abundant, colourless, crystalline compound composed of two elements Oxygen and Silicon.It is generally founds in all metamorphic rocks.
Steel is composed of a number of elements. The two essential elements are iron and Carbon.

Convection is the heat transfer due to bulk movement of molecules within fluids such as gases and liquids, including molten rock (rheid). Convection takes place through advection, diffusion or both.

Laser is the acronym for Light Amplification by Stimulated Emission of Radiation. laser produces beam of light waves of same frequency same amplitude and same phase, unlike ordinary light which consists of waves of different wavelengths.

O Rh D negative blood are often called universal donors and AB Rh D positive blood are called universal recipients.

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