Know more about Universe and space ...

Here you wounder about galaxies , types of galaxies , milky ways myth and even more , knowing everything is good but understanding  makes you better.

Universes - experts call these the " Our place in space "

Earth seems huge to us after all, it can take you a long time just to travel to school! But Earth is only a very tiny part of space. So where exactly does it belong in the Universe?

The Earth and its moon

Earth, our home in space , has one natural satellite, our moon. The moon is about one quarter the size of Earth and, on average, it orbits about 384,000 km (240,000 miles) from us.

The solar system

Earth is the third planet from the Sun, at just the right distance from it to support life. The eight planets that orbit the Sun (plus moons, comets, asteroids, meteors, dust, and gas) make dwarf planets, up our solar system.

In a spin Our galaxy has long curved arms that spiral out from a central bulge.

The Milky Way

Our solar system is located in a galaxy called the Milky Way, a collection of billions of stars. It lies on the edge of one of the spiral arms.

The Local Group

The Milky Way is one of the largest galaxies in a cluster known as the Local Group. Millions of galaxy clusters make up the Universe.

Great galaxies

A galaxy is a family of stars, gas, and dust held together by gravity. Much of a galaxy is empty space, with distances between each star that are hard to imagine.

Many galaxies are found in galaxy clusters, with thousands of members. Our galaxy, the Milky way, belongs to a clusters of about 30 galaxies called              local Group.

A guide to galaxies

Galaxies differ enormously in size, shape, and mass, but they do fall into a basic pattern, depending on their shape (but we don't know what gives them a particular shape!).

Collision course

Two galaxies may collide in a process that will take millions of years. The stars within the galaxy won't collide, but the gas and dust will – this collision can create new stars.

Two galaxies may sometimes collide.

What are types of Galaxy:

Spiral galaxies - These disc-shaped galaxies spin slowly. They look a bit like whirlpools, and often have two arms that curl out from a central bulge.

Barred spiral galaxies - Barred spiral galaxies have arms that wind out from the ends of a central bar of stars rather than from the core.

Elliptical galaxies - These are ball- or egg-shaped and largely made up of old stars. They don't contain the gas clouds for the formation of new stars.

Irregular galaxies - These have no shape. They contain lots of gas and dust, and many are therefore active nurseries for the formation of new stars.

The Milky Way

Our solar system is a tiny tiny! part of a gigantic spiral galaxy, the Milky Way. This is made up of billions of stars, which look as if they have been sprinkled thickly into the night sky.

Scientists think there are about 100,000 million stars in the Milky Way galaxy, but there may be even more.

Why is it milky?

Before the invention of telescope, people could not see the stars very clearly - they were blurred together in a hazy white streak. The ancient Greeks called this streak a "river of milk". This is how our galaxy became known as the Milky Way.

It takes light 100,000 years to pass from one edge of the milky way to the other.

Milky myths

• Many myths have developed about the formation of the Milky Way.
• Native American stories tell of a dog dropping corn as he fled across the sky.
• Kalahari bushmen say it was created by hot embers thrown up from a fire.
• Hindu myth sees the milkiness as the speckled belly of a dolphin.
• The ancient Egyptians believed the stars were a pool of cow's milk.

A side view

The Milky Way, like all spiral galaxies, is flat, with a bulge at the centre, and arms that circle outwards.

Nearby stars

Our star is the Sun. It seems a very long way away, yet the Sun's light takes just over eight minutes to reach us. The light from our next nearest star, Proxima Centauri, doesn't get to Earth for more than four years.

Light years away

Astronomers measure space distance in light years, because the distances are so great that normal measurements have little meaning. A light year is the distance light travels in a year.

Why do stars twinkle?

Stars twinkle because of movements in the Earth's atmosphere. Starlight enters the atmosphere as straight rays, but air moves the light's path so it appears to flicker or "twinkle".

Proxima Centauri

Proxima  Centauri was only discovered in 1915. It's very faint, so it can't be seen without the aid of a telescope. It looks red because it's a red dwarf star.

Nearest neighbours?

Proxima Centauri lies in a group of three stars called Alpha Centauri. The others are Alpha Centauri A and Alpha B. Alpha A is like our Sun, so experts believe it may have planets that support life.

The Universe

The Universe takes in Earth and its moon, the Sun and the solar system, the Milky Way, the galaxies we know, and the galaxies we haven't yet discovered. A typical galaxy contains over 100,000.That's big...The galaxies are spread over such unimaginable distances that even a space probe would take two billion years to cross our galaxy...and getting bigger ,The Universe is still expanding, so all the galaxies are moving farther and farther apart.

Dark mysteries

We can't see everything in space. Experts think there's lots of mysterious "dark matter" between the stars.More of the same?There might be other, parallel, multiverse".

                                                  

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