What is space ?🌈what is Dark Matter? Solar Wind | Temprature of Space| Corona| Part-1 |in Hindi
What is space ??what is Dark Matter? Solar Wind | Temprature of Space| Corona| Part-1 |in Hindi
From the perspective of an Earthling, outer space is a zone that occurs about 100 kilometers (60 miles) above the planet, where there is no appreciable air to breathe or to scatter light. In that area, blue gives way to black because oxygen molecules are not in enough abundance to make the sky blue.
Further, space is a vacuum, meaning that sound cannot carry because molecules are not close enough together to transmit sound between them. That's not to say that space is empty, however. Gas, dust and other bits of matter float around "emptier" areas of the universe, while more crowded regions can host planets, stars and galaxies.
No one knows exactly how big space is. The difficulty arises because of what we can see in our detectors. We measure long distances in space in "light-years," representing the distance it takes for light to travel in a year (roughly 5.8 trillion miles, or 9.3 trillion kilometers).
From light that is visible in our telescopes, we have charted galaxies reaching almost as far back as the Big Bang, which is thought to have started our universe 13.7 billion years ago. This means we can "see" into space at a distance of almost 13.7 billion light-years. However, astronomers are not sure if our universe is the only universe that exists. This means that space could be a lot bigger than it appears to us.
Stars, planets, asteroids and comets
Stars (like our own sun) are immense balls of gas that produce their own radiation.
They can range from red supergiants to cooling white dwarfs that are the leftovers of supernovas,
or star explosions that occur when a big one runs out of gas to burn.
These explosions spread elements throughout the universe and are the reason that elements such as iron exist.
Star explosions can also give rise to incredibly dense objects called neutron stars.
If these neutron stars send out pulses of radiation, they are called pulsar stars.
Our sun is surrounded by a jacket of gases called an atmosphere. The corona is the outermost part of the sun's atmosphere.
The corona is usually hidden by the bright light of the sun's surface. That makes it difficult to see without using special instruments. However, the corona can be seen during a total solar eclipse.
During a total solar eclipse, the moon passes between Earth and the sun. When this happens, the moon blocks out the bright light of the sun. The glowing white corona can then be seen surrounding the eclipsed sun.
Referance:
https://en.wikipedia.org/wiki/Corona
https://spaceplace.nasa.gov/sun-coron...
https://www.space.com/24870-what-is-s...
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