Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2022 April 5
The featured image shows a wide field with the red California Nebula on the far left, the blue Pleiades Star Cluster on the right, and much brown interstellar dust in between. Please see the explanation for more detailed information.

Seven Sisters versus California
Image Credit & Copyright: Neven Krcmarek

Explanation: On the upper right, dressed in blue, is the Pleiades. Also known as the Seven Sisters and M45, the Pleiades is one of the brightest and most easily visible open clusters on the sky. The Pleiades contains over 3,000 stars, is about 400 light years away, and only 13 light years across. Surrounding the stars is a spectacular blue reflection nebula made of fine dust. A common legend is that one of the brighter stars faded since the cluster was named. On the lower left, shining in red, is the California Nebula. Named for its shape, the California Nebula is much dimmer and hence harder to see than the Pleiades. Also known as NGC 1499, this mass of red glowing hydrogen gas is about 1,500 light years away. Although about 25 full moons could fit between them, the featured wide angle, deep field image composite has captured them both. A careful inspection of the deep image will also reveal the star forming region IC 348 and the molecular cloud LBN 777 (the Baby Eagle Nebula).

Tomorrow's picture: far star < | Archive | Submissions | Index | Search | Calendar | RSS | Education | About APOD | Discuss | >

Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
NASA Official: Phillip Newman Specific rights apply.
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Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2022 April 6
The featured image depicts a star in the distant universe
that has been magnified by a foreground cluster of galaxies
to appear over one thousand times brighter here on Earth.
Please see the explanation for more detailed information.

Earendel: A Star in the Early Universe
Image Credit: NASA, ESA, B. Welch (JHU), D. Coe (STScI); Processing: A. Pagan (STScI)

Is Earendel the farthest star discovered? The Hubble Space Telescope observed a huge cluster of galaxies. The cluster was seen to distort a galaxy far in the background. A distorted background galaxy, which has a redshift of 6.2, appears in the featured image as a long red string, while beads on that string are likely to be star clusters. Earendel is a bead that shows evidence of being from a single bright star in the early universe, on the intersection between the galaxy line and the maximum magnification line. Earendel's brightness may be seen by the new James Webb Space Telescope when it becomes operational later this year.

Tomorrow's picture: open space

< | Archive | Submissions | Index | Search | Calendar | RSS | Education | About APOD | Discuss | >

Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
NASA Official: Phillip Newman Specific rights apply.
NASA Web Privacy Policy and Important Notices
A service of: ASD at NASA / GSFC
& Michigan Tech. U.