Question: Why do stars twinkle?

Colin Johnston answered on 11 Nov 2014:

Stars twinkle as they’re so far away from Earth that they appear only as pinpoints of light. As that light passes through a hundred km or so of atmosphere overhead, air movements disturb the narrow beam of starlight causing the star to slightly flicker or wobble to our eyes

To astronauts in space, above the atmosphere, the stars shine steadily. There is nothing to disturb the steady streaming of their light.