Question

drag each tile to the correct location.
determine which physical conditions are necessary to support nuclear fusion and formation of stars.
lower temperature higher temperature increased gravitational attraction
decreased gravitational attraction
promotes stellar formation does not promote stellar formation

Explanation:

• Higher temperature: Nuclear fusion requires high temperatures to overcome the electrostatic repulsion between positively - charged atomic nuclei. In stars, high temperatures (millions of degrees Celsius) are needed for hydrogen nuclei to fuse into helium.
• Increased gravitational attraction: Gravity pulls gas and dust together. As the cloud of gas and dust (a stellar nebula) contracts due to increased gravitational attraction, it heats up (through the conversion of gravitational potential energy into thermal energy). This contraction also increases the density, which is necessary for the conditions of nuclear fusion (high density and high temperature) to be met.
• Lower temperature: Lower temperatures do not provide enough kinetic energy for nuclei to overcome their electrostatic repulsion (Coulomb barrier) and fuse.
• Decreased gravitational attraction: If gravitational attraction is decreased, the gas and dust cloud (stellar nebula) will not contract. Without contraction, there will be no increase in temperature and density, which are essential for nuclear fusion and star formation.

Answer:

Promotes Stellar Formation	Does Not Promote Stellar Formation