The sky on
your birthday.
NGC 4676: When Mice Collide
These two galaxies, NGC 4676, are known as the "Mice" because of their long tidal tails. They are about 300 million light-years away and are in the process of pulling each other apart through gravitational interaction. Each spiral galaxy has likely already passed through the other, with the tails formed by the differential gravitational pulls over hundreds of millions of years.
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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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The Sun on your day The Sun on 4 October 2021 See it as a poster -
The Earth on your day The Earth on 4 October 2021 · Sahara, Algeria See it as a poster -
Released on 4 October 2024 Westerlund 1 (wide-field view) See it as a poster -
Released on 4 October 2010 Star formation fireworks in Orion See it as a poster -
Released on 4 October 2005 NASA Space Observatories Glimpse Faint Afterglow of Nearby Stellar Explosion See it as a poster -
Released on 4 October 2021 A Dangerous Dance See it as a poster -
Released on 4 October 2022 The aurora australis intersects Earth's atmospheric glow in this photograph from the International Space Station as it See it as a poster
In tropical astrology, 4 OCT 2021 falls under Libra (♎). The sign's window runs from 09-23 through 10-22. Libra is the only zodiac constellation named for an inanimate object, the scales of judgment. The Sun was crossing this region of the sky on 4 OCT 2021.
Questions about October 4, 2021
What space photo was released on October 4, 2021?
NASA's Astronomy Picture of the Day for October 4, 2021 was "NGC 4676: When Mice Collide". It's the card at the top of this page.
What was the Moon's phase on October 4, 2021?
A waning crescent moon, about 4% lit.
What day of the week was October 4, 2021?
October 4, 2021 was a Monday, day 277 of the 365 days in 2021.
What did the Sun and the Earth look like on October 4, 2021?
NASA's Solar Dynamics Observatory photographed the Sun that day, and NASA's Terra satellite photographed the whole Earth. Both are on this page, next to the card.
Is it free?
Yes. Seeing, sharing and downloading the card is free, and there's no account to make.