You are flying your personal rocketcraft at 0.9c from star a toward star b. the distance between the stars, in the stars' reference frame, is 1.0 ly. both stars happen to explode simultaneously in your reference frame at the instant you are exactly halfway between them.

the question asked of the aforementioned scenario is "do you see the flashes simultaneously? " and what is the time difference between the two?

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Inner peace.. jk it's  a stable electron configuration

Stars are born within the clouds of dust and scattered throughout most galaxies. a familiar example of such as a dust cloud is the orion nebula. turbulence deep within these clouds gives rise to knots with sufficient mass that the gas and dust can begin to collapse under its own gravitational attraction. as the cloud collapses, the material at the center begins to heat up. known as a protostar, it is this hot core at the heart of the collapsing cloud that will one day become a star. three-dimensional computer models of star formation predict that the spinning clouds of collapsing gas and dust may break up into two or three blobs; this would explain why the majority the stars in the milky way are paired or in groups of multiple stars.therefor, i would say the answer is: dust and gases contract.i hope this ! < 3