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Despite this great distance, the star would be visible to the naked eye if it were not for all the dust between it and the earth Nuclear fusion produces a lot of energy As of january 2009, we now know about some other really big stars

One is called eta carinae. A process called nuclear fusion takes place there To introduce the lesson, have the students complete the just how big is this place

This activity will allow them to start associating typical sizes to objects and ranking them in order from smallest to largest

The next part of the lesson will be where the students manipulate the actual numbers involved in exploring the universe. A star is a big ball of gas which gives off both heat and light So where do stars come from What happens to them as they grow older

A galaxy contains clouds of dust and gas, as well as stars It is in the clouds of dust and gas that stars are born As more and more of the gas (which is mostly hydrogen) is pulled together by gravity into a cloud, the cloud starts to spin Results from nasa's wilkinson microwave anisotropy probe (wmap) released in february 2003 show that the first stars formed when the universe was only about 200 million years old

Observations by wmap also revealed that the universe is currently about 13

So it was very early in the time after the big bang explosion that stars formed. Cosmologists use this measurement to extrapolate back to the big bang, the explosion which occurred at the start of the known universe This extrapolation depends upon the current density of the universe and on the composition of the universe If the universe is flat and composed mostly of ordinary matter, then the age of the.

Big bang theory a theory which states that the universe began to expand after a super powerful explosion of concentrated matter and energy Black hole the leftover core of a super massive star after a supernova Black holes exert a tremendous gravitational pull. No one knows just how big the universe is

Astronomers try to measure it all the time

They use a special instrument called a spectroscope to tell whether an object is moving away from earth or toward earth Based on the information from this instrument, scientists have learned that the universe is still growing outward in every direction. The sun glows because it is a very big ball of gas, and a process called nuclear fusion is taking place in its core Nuclear fusion occurs when one proton smashes into another proton so hard that they stick together.and release some energy as well

This energy then heats up the other materials (other protons and electrons and such) nearby. What is a brown dwarf In order to understand what is a brown dwarf, we need to understand the difference between a star and a planet It is not easy to tell a star from a planet when you look up at the night sky with your eyes

However, the two kinds of objects look very different to an astronomer using a telescope or spectroscope

Planets shine by reflected light The sun is our closest star It is a member of the milky way galaxy The sun is a yellow dwarf star, which means it is a medium size star

It is believed to be over 4 billion years old The sun spins slowly on its axis as it revolves around the galaxy The center, or core, of the sun is very hot

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