NEBULA

• NEBULA IS A GROUP OF DUST AND GAS IN A GALAXY
• THEY BECOME VISIBLE WHEN THE GAS INSIDE THEM GLOWS OR WHEN THEY REFLECTS BACK THE LIGHT FROM OTHER OBJECTS
• NEBULA CAN BE CLASSIFIED INTO THREE ON THE BASIS OF ITS GLOW.THEY ARE:

1. MISSION NEBULA
2. REFLECTION NEBULA
3. DARK NEBULA

• EMISSION NEBULA:WHEN THE RADIATION FROM HOT YOUNG STARS EREACHES THE NEBULA,THE GASES IN IT GETS STIMULATED AND GLOWS
• REFLECTION NEBULA:THESE NEBULA REFLECTS THE LIGHT RECEIVED FROM THE STARS FROM ITS SURROUNDINGS
• DARK NEBULA:BLOCKS OUT LIGHT FROM SHINING NEBULAE OR STARS