Astronomy Picture of the Day · October 10, 1999

Triton: Neptune's Largest Moon

The Astronomy Picture of the Day for October 10, 1999 is “Triton: Neptune's Largest Moon,” an image. It is credited to Credit: Voyager 2, NASA. The original explanation runs about 135 words.

From the explanation

“One hundred and fifty three years ago, on October 10th, 1846, William Lassell was observing the newly discovered planet Neptune . He was attempting to confirm his observation, made just the previous week, that Neptune had a ring.”

— APOD editors, October 10, 1999

Read the full explanation on science.nasa.gov

At a glance

Date: October 10, 1999
Type: Image
Credit: Credit: Voyager 2, NASA
Copyright: No copyright notice on the entry. Check the credited institution’s own usage rules before reusing it.
Explanation length: About 135 words

All of October 1999 → · 1999 by month → · Full archive since 1995 →

Topics in this entry

The Moon

Topics are matched from words in the title and explanation.

On this day: October 10 in other years

On Amazon

Popular picks for space fans

As an Amazon Associate I earn from qualifying purchases.

Electronics Amazon Kindle Paperwhite Signature Edition 32GB Read astronomy and space-history books anywhere. View on Amazon → Electronics Bose QuietComfort Wireless Headphones Noise-cancelling headphones for documentaries and launch livestreams. View on Amazon →

Source

Astronomy Picture of the Day, October 10, 1999 — science.nasa.gov/image-article/apod-1999-october-10-triton-neptunes-largest-moon

Copy taken Oct 28, 2026, 2:39 AM EDT. The image and explanation belong to their creators. OpenOrbit is not affiliated with or endorsed by NASA.