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  1. livescience.com

    Aug 24, 2023The dark spot on Neptune was strange, however, because it disappeared after Voyager 2's observations. ... "The fact that it's so close to the dark spot is interesting and suggests some connection ...
  2. spaceplace.nasa.gov

    Jan 14, 2025Neptune is dark, cold, and very windy. It's the last of the planets in our solar system. It's more than 30 times as far from the sun as Earth is. Neptune is very similar to Uranus. It's made of a thick fog of water, ammonia, and methane over an Earth-sized solid center. Its atmosphere is made of hydrogen, helium, and methane.
  3. sciencealert.com

    Aug 25, 2023Ever since Voyager 2 flew past Neptune in 1989, the giant dark smudges that appear in the distant planet's atmosphere have presented a strange puzzle.. Now, for the first time, we have observed one with Earth-based instruments in unprecedented resolution, helping scientists figure out why those patches appear so dark and why they are so different from spots on other planets.
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  5. en.wikipedia.org

    Neptune is the eighth and farthest known planet from the Sun.It is the fourth-largest planet in the Solar System by diameter, the third-most-massive planet, and the densest giant planet.It is 17 times the mass of Earth.Compared to its fellow ice giant Uranus, Neptune is slightly more massive, but denser and smaller.Being composed primarily of gases and liquids, [21] it has no well-defined ...
  6. astronomy.stackexchange.com

    The lower opacity of Neptune's Aerosol-2 layer also explains why dark spots … are easier to observe in Neptune's atmosphere than in Uranus's. Below Aerosol-2, there is another layer called "Aerosol-1 layer" which is a deeper haze layer, where the methane re-evaporates and redeposits the haze particles.
  7. communities.springernature.com

    Neptune's dark spots are short-lived vortices that appear every few years and are dark at blue wavelengths. This paper presents the first ever detection and analysis of a dark spot spectrum from the ground, using MUSE at ESO's VLT, and reveals the aerosol layer at 5 bar as the source of darkness.
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