Astronomy Knowledge

2023-02-10 22:25:50 Looking up at the moon in the night sky, you would never imagine that it is slowly moving away from Earth. But in 1969 NASA's Apollo missions installed reflective panels on the moon. These have shown that the moon is currently moving 3.8 cm away from the Earth every year. ክፈት / አስተያየት ይስጡ

2023-02-10 19:38:01 Join for crazy Science facts! ክፈት / አስተያየት ይስጡ

2023-02-08 17:34:03 ​Why is it that Saturn’s moon Titan has a dense atmosphere, yet Jupiter’s Ganymede and Callisto (about the same size as Titan) do not?

Blame it on their parent planets. All three moons are a mixture of rocky materials and water ice, and the crystalline structure of ice is particularly good at trapping atoms of gas. But the outward characteristics of these moons are rather different, having been determined by the conditions near each planet as it formed.
—For example, the newborn Jupiter was so hot that it probably glowed. This heat drove off all the water within Io and most of it from Europa. Ganymede and Callisto kept their ice, but they still got hot enough to lose most of the gas that might otherwise have been trapped in their icy interiors. Consequently, none of the Galilean moons ended up with a substantial atmosphere.
—By contrast, the conditions around Saturn were generally colder. Titan managed to trap considerable gas-rich ice in its interior. Over time, heat from infalling objects and from the decay of radioactive elements within its rocks liberated much of this gas, creating the dense nitrogen-rich atmosphere we see today. ክፈት / አስተያየት ይስጡ

2023-02-07 21:45:04 Does the Sun move around the Milky Way?

Yes, the Sun - in fact, our whole solar system - orbits around the center of the Milky Way Galaxy. We are moving at an average velocity of 828,000 km/hr. But even at that high rate, it still takes us about 230 million years to make one complete orbit around the Milky Way. ክፈት / አስተያየት ይስጡ

2023-02-06 14:13:26 ​NASA Rover Encounters Spectacular Metal Meteorite on Mars.

MSL Curiosity is going about its business exploring Mars. The high-tech rover is currently exploring the sulphate-bearing unit on Mt. Sharp, the central peak in Mars' Gale Crater. Serendipity placed a metal meteorite in its path.
—The meteorite is made mostly of nickel and iron, and it has a name: Cacao. (Chocolate comes from cacao.) Cacao isn't very large; it's only about 30 cm (1 ft.) across.
—Curiosity has come across several meteorites since landing in Gale Crater in August 2012.
—Cacao stands out visually from its surroundings. While the Martian surface is red from oxides, the meteorite is dark grey and metallic-looking. It's also smooth and rounded, obvious signs that it passed through an atmosphere. ክፈት / አስተያየት ይስጡ

2023-02-05 13:56:32 Explaining a Solar Mystery
– Princeton Researchers Have Discovered a Previously Hidden Heating Process

Researchers discovered a previously unknown heating mechanism that explains why the “solar corona,” the atmosphere surrounding the Sun, is much hotter than the solar surface that emits it. The finding at the Princeton Plasma Physics Laboratory (PPPL) of the U.S. Department of Energy (DOE) has the potential to help resolve several astrophysical mysteries, including star formation, the source of large-scale magnetic fields in the universe, and the prediction of space weather events that can cause cell phone outages and power grid failures on Earth. Understanding the heating process also has significant implications for fusion energy research..Read More ክፈት / አስተያየት ይስጡ

2023-02-05 13:43:06 Earth with rings like Saturn.

Hashem Al-Ghaili ክፈት / አስተያየት ይስጡ

2023-02-04 23:42:10 @astronomic ክፈት / አስተያየት ይስጡ

2023-02-01 22:49:57 Wolfe Creek Crater!!

—The Wolfe Creek impact crater is well-preserved and located in Australia.
It was formed from the impact of an iron meteorite weighing about 5,000 tons about 300,000 years ago.

It is 880 m in diameter.
The depth is 60 m. ክፈት / አስተያየት ይስጡ

2023-01-30 16:51:06 The sound of a black hole.

Spark Shorts ክፈት / አስተያየት ይስጡ