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From the dawn of human civilisations, Sun has played a crucial role in
the wonderland of the human mind. It has been perceived as a powerful
deity in the mythology of many civilisations because of its role in providing
the life on Earth. Today, we know that it is an ordinary star, which is centred at our solar system. It bears more than 99% mass of the solar system and holds all the planets in the solar system together
by its gravity.
The Sun has formed 4.5 billion years ago from the collapse of a giant, rotating cloud of gas and dust, called the solar nebula. It is a Population I star that is rich in heavy elements, and formed from the remnants of the supernova explosion of a previous giant star. It is primarily composed of hydrogen (73%) and helium (25%) with a negligible amount of heavier
elements such as oxygen, carbon, neon, silicon, magnesium and iron.
The Sun is a main-sequence star with a spectral class of G2V. It is located at a distance of 1.496× 108 km (1 AU) from the Earth and has a radius of 696,342 65 km, which is about 109 times the radius
of the Earth. The mass of Sun is 1.9885 × 1030 kg, and its luminosity
is 3.86 × 1026 W. The solar spectrum can be approximated by blackbody
radiation with a temperature of 5785 K, that corresponds to the effective
surface temperature of the Sun .
The study of the Sun can be divided into two parts. The solar interior
that is composed of the core, the radiative zone and the convective
zone, and the solar atmosphere that includes the photosphere, the chromosphere,
the transition region and the corona. Solar interior is primarily divided into three main regions based on energy
generation and transfer processes. They are - the core, the radiative &
the convective zone.
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
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