21 Dec 2025, 12:32 UTC276 views7 reactionsread 9 August 2026 Photo
WINTER SOLSTICE
The Winter Solstice is the shortest day and longest night of the year, happening when Earth's tilt points a hemisphere farthest from the Sun, usually December 21-22 in the North and June 20-21 in the South, marking the astronomical start of winter and a time of rebirth as days begin to lengthen again, celebrated with ancient festivals like Yule.
The winter solstice marks what is known as the "astron…
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18 Dec 2025, 16:53 UTC242 views4 reactionsread 9 August 2026 Photo
On today's date in 1966,Saturn’s moon Epimetheus was discovered by astronomer Richard L. Walker during early observations of Saturn's complex satellite system.
Early Observations🌑
Before the discovery was firmly established, a potential observation of Epimetheus was made using the Pioneer 11 spacecraft images, which designated it as S/1979S1. However, these images were insufficient to calculate a reliable orbit, le…
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15 Dec 2025, 09:52 UTC194 views4 reactionsread 9 August 2026 Photo
"The experiments not only provide us with insight into the dynamics of electron tunnelling for the first time," says physicist Krausz. "We have also shown that the movement of electrons in atoms or molecules can be observed in real time with the aid of laser field-induced tunnelling."
Based on this finding and the enabled control over electron movement within the atom, in the future scientists will be able to resea…
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Channel name was changed to «Astronomy arena💥🌃✨☄️»
20 Aug 2022, 02:39 UTC≈2,580 viewsread 9 August 2026 Photo
@astro_arena
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16 Jul 2022, 14:00 UTC≈2,510 viewsread 9 August 2026 Why would the compass fail to work on Mars?
🧭Mars lacks a complete planetary magnetic field. There are only small magnetic anomalies, where the field is about 500 times weaker than on Earth. They are generated by magnetized rocks in the crust of Mars, not by the magnetic dynamo in the planet's core, as in the case of Earth.
Zones of magnetic anomalies are located irregularly, so that even a very sensitive compass c…
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30 Apr 2022, 08:12 UTC≈1,820 viewsread 9 August 2026 Photo
WHY is the axis of Uranus "horizontal"?
Unlike the other planets of the solar system, Uranus "lies on its side" relative to the plane of orbit around the Sun. If the Earth is commonly compared to a spinning, slightly inclined wolf, which moves around the Sun, the movement of Uranus resembles that of a rolling orbital ball.
The reasons for this position of the axis of Uranus remain unknown, but the main hypothesis s…
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17 Apr 2022, 03:23 UTC≈1,350 viewsread 9 August 2026 Photo
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17 Apr 2022, 03:19 UTC≈1,020 viewsread 9 August 2026 Photo
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10 Mar 2022, 12:56 UTC947 views1 reactionsread 9 August 2026 Photo
@astro_arena
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5 Mar 2022, 03:04 UTC724 viewsread 9 August 2026 Forwarded from @Why_ExplainedPhoto
WHY do launch vehicles fly exclusively in an arc?
Launch vehicles are started on an arc-shaped trajectory to get the spacecraft into orbit properly. At the first stage, the spacecraft moves upwards, overcoming air resistance, and when above 100 kilometers the atmosphere gets thin enough, the rocket changes its trajectory to reach the target orbit with minimum fuel consumption.
If the launch vehicle is lifted direct…
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6 Feb 2022, 07:10 UTC524 viewsread 9 August 2026 Photo
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Showing the 12 most recent of 20 posts we hold for @astro_arena. View and reaction counts are the latest single reading for each post, not a live figure, and a recent post is still accumulating both. A view count marked ≈ was rounded by Telegram before we ever saw it — t.me prints views in full below 1,000 and to three significant figures above, so ≈1,200,000 means somewhere between 1,150,000 and 1,249,999. Unmarked counts are exact. Text is reproduced from the public post preview and truncated for length.