Nebulas

Introduction

The space between the stars is not empty at all. There are gasses and small dustparts. At some places they melt together in clouds. These are called nebulas.

Bright and dark nebulas

Some nebulas contain very hot stars that are shining brilliant. The energy that is being absorbed is taking care for the light that the clouds are shining. These nebulas are called emissienebulas. An example is the constellation Orion.
When a star outside gas- and dust cloud is, the cloud can reflect the light. We see this as an reflection nebula.
There are also a lot of dust clouds which are not being lighted bye stars. You can see these clouds as dark spots. That why these nebulas are called dark nebulas.

Dust

Dust is not always in clouds. You can find it everywhere between the stars. This dust stops a part of the light of the stars. In our galaxy there is much dust. It is blocking our outlook to the centre of our galaxy.
There are substances that exist out of little spots carbon or silicate (like stones on earth). Sometime these spots are wraps round bye ice. Between the stars there are also big spurs found of other substance, within aqua, alcohol, and glycerine. Glycerine is an aminoacid, one of the building stones of life.

Molecules between the stars

Astronomy have found more than fifty different kind of chemical substances in the gas- dust clouds between the stars. Some of the molecules become visible in the spectrum of light. Other are recognisable because of their radiowaves. It is very interesting that there are different kinds of carbon compounds between the molecules. Carbon compounds are forming the base of life on earth. A few of the carbon compounds are:

Name	Formula
Cyan	CN
Hydroxyl	OH
Ammonia	NH₃
Water	H₂O
Carbonmonoöxide	CO
Hydrogen	H₂
Sulfurdioxide	SO₂
Antacid	HCO₂H
Ethanol	CH₃CH₂OH

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