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Ch 11 The Formation of Stars

Felicity Williams
Across
A large loosely bound cluster of very young stars
Small dark cloud only about 1 ly in diameter that contains 10 to 1000 M of gas and dust
The balance between the weight of a material pressing downward on a layer in a star and the pressure in that layer
The resistance of gas to the passage of radiation
The line above the main sequence where protostars first become visible
Group of widely scattered stars moving together through space
The astronomical equivalent to a sonic boom
Down
The early stage of the formation of a star
A series of nuclear reactions that use carbon as a catalyst to combine four hydrogen atoms to make one helium atom plus energy
The cloud of gas and dust around a contracting protostar
Oppositely directed jets of gas ejected by some protostellar object
A collapsing cloud of gas and dust destined to become a star
The column of gas produced when a dense core of gas protects the nebula
Small nebula that contains varies irregularly in brightness
A gas cloud around a forming star flattened by rotation
A large loosely bound group of T Tauri stars
Young star surrounded by gas and dust