The sky on
your birthday.
Gamma Ray Moon
If you could see gamma rays, the Moon would appear brighter than the Sun. This image from the EGRET instrument on the Compton Gamma Ray Observatory shows how the Moon glows with high-energy photons. The Moon is bright in gamma rays because it reflects cosmic rays, which then produce gamma rays when they hit the lunar surface. The quiet Sun, by contrast, is very faint at these extreme energies.
We cannot put this date's photograph on paper at poster size. We can print the nearest public archive plate to your date instead.
See print sizesPrinted, shipped and sold by Zazzle
Released on your day
Space pictures released on your month and day in other years, or a few days either side. Each one is sharp enough to print as a poster.
-
Released on 17 April 2014 Hubble’s cross-section of the cosmos See it as a poster -
Released on 17 April 2014 Digitized Sky Survey Image around CLASS B1608+656 (ground-based image) See it as a poster -
Released on 17 April 2021 Inside the Flame Nebula See it as a poster -
Released on 17 April 2023 Webb captures the spectacular galactic merger Arp 220 See it as a poster -
Released on 17 April 2023 Hubble spotlights a swirling spiral See it as a poster
In tropical astrology, 17 APR 1999 falls under Aries (♈). The sign's window runs from 03-21 through 04-19. Aries is the constellation traditionally tied to spring's arrival in the northern hemisphere. The Sun was crossing this region of the sky on 17 APR 1999.
Questions about April 17, 1999
What space photo was released on April 17, 1999?
NASA's Astronomy Picture of the Day for April 17, 1999 was "Gamma Ray Moon". It's the card at the top of this page.
What was the Moon's phase on April 17, 1999?
A new moon, about 3% lit.
What day of the week was April 17, 1999?
April 17, 1999 was a Saturday, day 107 of the 365 days in 1999.
Is it free?
Yes. Seeing, sharing and downloading the card is free, and there's no account to make.