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Space Facts

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Interesting Facts about Space  1.Space does not begin at a specific altitude above the Earth, but the Kármán line at 100 km is a commonly used definition. 2  The temperature in the void of space is about −270.45 °C. 3  Space is a hard vacuum, meaning it is a void containing very little matter. 4  There is no sound in space because molecules are too far apart to transmit sound. 5 The space between galaxies is not completely empty but has an average of one atom per cubic meter. 6 There are an estimated 100-400 billion stars in our galaxy, the Milky Way. 7 The universe is observed to be 13.8 billion years old and has been expanding since its formation in the Big Bang. 8 In the observable universe there are an estimated 2 trillion (2,000,000,000,000) galaxies. 9 The International Space Station is the largest ever crewed object in space. 10 Spacecraft have visited all the known planets in our solar system.   The Solar System Asteroid Bel...
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What is DNA replication?

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Definition: DNA replication is a fundamental process occurring in all living organisms to copy DNA. In this process, each strand of the parent double-stranded DNA molecule acts as a template for the synthesis of the complementary daughter strand. It proceeds from 5’ to 3’ direction. DNA replication is the process by which DNA makes a copy of itself during cell division.   DNA replication  The first step in DNA replication is to ‘unzip’ the double helix structure of the  DNA ?  molecule. This is carried out by an  enzyme ?  called helicase which breaks the  hydrogen bonds ?  holding the  complementary ?   bases ?  of DNA together (A with T, C with G). The separation of the two single strands of DNA creates a ‘Y’ shape called a replication ‘fork’. The two separated strands will act as templates for making the new strands of DNA. One of the strands is oriented in the 3’ to 5’ direction (towards the replicati...
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