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A Hubble image of the Andromeda Galaxy, tilted from the bottom left to top right. The outer edges of the galaxy are blue, while the inner two-thirds is yellowish with a bright, central core. Four inset boxes form an arc along the top portion of the galaxy, each showing a bright white star in the center surrounded by other stars. Each box has a correlating date at the bottom: Dec. 17, 2020, Dec. 21, 2010, Dec. 30, 2019, and Jan. 26, 2011. The center star in the boxes appears brighter with each passing date. An arrow from galaxy’s right center spiral arm points to the boxes, indicating where the star originates in the galaxy.

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A Hubble image of the Andromeda Galaxy, tilted from the bottom left to top right. The outer edges of the galaxy are blue, while the inner two-thirds is yellowish with a bright, central core. Four inset boxes form an arc along the top portion of the galaxy, each showing a bright white star in the center surrounded by other stars. Each box has a correlating date at the bottom: Dec. 17, 2020, Dec. 21, 2010, Dec. 30, 2019, and Jan. 26, 2011. The center star in the boxes appears brighter with each passing date. An arrow from galaxy’s right center spiral arm points to the boxes, indicating where the star originates in the galaxy.
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Space Telescope Science Inst. (spacetelescope@astrodon.social)'s status on Thursday, 16-Jan-2025 03:44:28 JST Space Telescope Science Inst.

We are joining Carnegie Science in celebrating the 100th anniversary of Edwin Hubble’s discovery of galaxies existing beyond our Milky Way. He found a stellar “milepost marker” embedded in Andromeda and calculated it is outside our galaxy: https://bit.ly/40r30L6 #AAS245

In conversation about 15 days ago from astrodon.social permalink