When and How did the universe begin?
It is generally believed by astronomers that about 15 billion years ago,
there was a massive explosion which sect the ’young’ universe flying out
in all directions. Over time, the bits came together to form galaxies. The
galaxies are still drifting apart today and the universe is getting bigger and
bigger. This has become known as the Big Bang theory of the origin the of the
universe, which is by far the theory best supported by scientific evidence.
However, no one has a clue about where the material that forms the
universe came from in the first place.
What is the Milky Way?
The Milky Way is one of the billions of galaxies where we live in. It is made
up of all the stars you can see at night, and lots more that you can’t see.
The Milky Way is a spiral galaxy and from the side, it looks like two fried
eggs stuck together. The galaxy got its name because sometimes at night,
it looks like a band of milky white light across the sky.
How many stars are there in the Milky Way?
According to astronomers, there are over 1,000 billion stars in the Milky
Way. That is nearly 200 stars for every human being living on Earth today.
How hot is the Sun?
Like all stars, the Sun is a huge ball of super-hot gas. It is hottest in the
core and the temperature there is about 15 million℃. The outside of the
Sun is cooler and the temperature there is about 6,000℃. The Sun is the
only star in the universe that is close enough for us to feel its heat. Light
from the Sun takes about 8 minutes to reach our planet.
Will the Sun ever go out?
One day, the sun will use up all its fuel and die. But don’t worry, as it won’t
happen in your lifetime. Scientists have estimated that the Sun has enough
gas fuel to last at least another 5 billion years. |
