As night falls, Scutum, the shield, stands above the teapot outline of Sagittarius. One of its stars, Delta Scuti, pulses in and out like a beating heart. That makes the star’s brightness vary by about 20 percent every 4.5 hours.
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As night falls, Scutum, the shield, stands above the teapot outline of Sagittarius. One of its stars, Delta Scuti, pulses in and out like a beating heart. That makes the star’s brightness vary by about 20 percent every 4.5 hours.