Put the following events associated with the formation of a Massive Mass Star in order. 1 to 6

Stage 1- Stars are born in a region of high density Nebula, and condenses into a huge globule of gas and dust and contracts under its own gravity.

This image shows the Orion Nebula or M42 .

Stage 2 - A region of condensing matter will begin to heat up and start to glow forming Protostars. If a protostar contains enough matter the central temperature reaches 15 million degrees centigrade.

This image is the outflow (coloured red)and protostar.

Stage 3 - At this temperature, nuclear reactions in which hydrogen fuses to form helium can start.

Stage 4 - The star begins to release energy, stopping it from contracting even more and causes it to shine. It is now a Main Sequence Star.

The nearest main sequence star to Earth, the Sun

Stage 5 - A star of one solar mass remains in main sequence for about 10 billion years, until all of the hydrogen has fused to form helium.

stage 6 - The helium core now starts to contract further and reactions begin to occur in a shell around the core.

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