High-speed gas collisions prevent star birth in galaxies’ bars

Simulations of a barred spiral galaxy explain why its bar fails to sparkle with newborn stars

Dark lanes of dust run along the yellow-orange bar in the middle of NGC 1300. That color means the region is engaged in little if any star formation—unlike the blue spiral arms.

NASA, ESA, Hubble Heritage Team/AURA/STScI. Acknowledgment: P. Knezek/WIYN.

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