January 4, 2026
Here’s to you, and all the wonder still ahead.
Birthday · January 4, 2026
A little universe, just for you
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Selected image source ↗ APOD published January 4, 2026. Full image credits are on the original APOD entry below. A publication-date match, not a photo taken on your date. Independent of NASA.
Read the original APOD for the astronomer’s explanation and full image credits. Its text is preserved in the archive as published.
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Most galaxies have a single nucleus -- does this galaxy have four? The strange answer leads astronomers to conclude that the nucleus of the surrounding galaxy is not even visible in this image. The central cloverleaf is rather light emitted from a background quasar. The gravitational field of the visible foreground galaxy breaks light from this distant quasar into four distinct images. The quasar must be properly aligned behind the center of a massive galaxy for a mirage like this to be evident. The general effect is known as gravitational lensing, and this specific case is known as the Einstein Cross. Stranger still, the images of the Einstein Cross vary in relative brightness, enhanced occasionally by the additional gravitational microlensing effect of specific stars in the foreground galaxy. Almost Hyperspace: Random APOD Generator
Explore January 4 in other years · 31 APOD entries, 1996–2026
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