The sky on
your birthday.
Hot Gas and Dark Matter
This image combines an optical view of galaxies with X-ray data from the ROSAT satellite. The red glow shows hot gas trapped by the cluster's gravity. This gas is so hot it emits X-rays. The presence of this gas indicates that the total gravitational pull of the galaxy cluster is much greater than the visible galaxies alone. This extra gravity is attributed to dark matter.
We cannot put this date's photograph on paper at poster size. We can print the nearest public archive plate to your date instead.
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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.
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Released on 4 April 2014 Iridescent Glory of Nearby Helix Nebula See it as a poster -
Released on 4 April 2019 Messier 2 See it as a poster -
Released on 4 April 2013 Hubble/Chandra/Spitzer composite image of NGC 602, in the “wing” of the Small Magellanic Cloud See it as a poster -
Released on 4 April 2009 Irregular galaxy NGC 55 See it as a poster -
Released on 4 April 2025 Stellar sculptors in NGC 346 See it as a poster
In tropical astrology, 4 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 4 APR 1999.
Questions about April 4, 1999
What space photo was released on April 4, 1999?
NASA's Astronomy Picture of the Day for April 4, 1999 was "Hot Gas and Dark Matter". It's the card at the top of this page.
What was the Moon's phase on April 4, 1999?
A waning gibbous moon, about 88% lit.
What day of the week was April 4, 1999?
April 4, 1999 was a Sunday, day 94 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.