10 lines on univers
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The Universe is everything we can touch, feel, sense, measure or detect. It includes living things, planets, stars, galaxies, dust clouds, light, and even time. Before the birth of the Universe, time, space and matter did not exist. The Universe contains billions of galaxies, each containing millions or billions of stars. The space between the stars and galaxies is largely empty. However, even places far from stars and planets contain scattered particles of dust or a few hydrogen atoms per cubic centimeter. Space is also filled with radiation (e.g. light and heat), magnetic fields and high energy particles (e.g. cosmic rays). The Universe is incredibly huge. It would take a modern jet fighter more than a million years to reach the nearest star to the Sun. Travelling at the speed of light (300,000 km per second), it would take 100,000 years to cross our Milky Way galaxy alone.
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Explanation:
10 lines on Universe
⇒ Every person, planet star and a galaxy is a part of a universe - and even empty space.
⇒ Universe can be defined as everything that exists. It is the biggest thing we have a word for.
⇒ the universe is too big, In speed of light, it would take about 15 billion years to cross it as far as we know.
⇒ The universe has started about 12 - 15 billion years ago, due to big bang.
⇒ Big bang was a huge explosion that created all the mass and energy in our universe in less than a second.
⇒ The big bang was super hot! It is 10^27°C, meaning 10 with 27 zeros after it.
⇒ The effects of the big bang is so strong that the universe is still expanding.
⇒ People who study universe are called as cosmologists.
⇒ Some cosmologists believe that universe will shrink back to a state of high temperature and density.
⇒ This belief in the shrink of universe is called big crunch. It is the opposite of Big Bang.