Mira vs ดาวเหนือ

ความแตกต่างหลัก

• ◆ Both are famous variable stars in the northern sky, though entirely different types.
• ◆ Polaris is a Cepheid variable that pulsates predictably and was used to calibrate the Cepheid distance ladder.
• ◆ Mira is a long-period Mira-type variable that can range from naked-eye visibility to complete invisibility.
• ◆ Polaris is celebrated as the North Star for its positional stability near the pole; Mira is celebrated as the first recognized variable star (1596).
• ◆ Polaris's pulsation amplitude has been shrinking over the past century; Mira continues its large-amplitude cycle.