The universe may contain thousands of galaxies, vast oceans of hot gas, invisible islands of dark matter, and sometimes a giant jellyfish. This strange space structure floats through space and scientists have no idea how it came to be.
In the galaxy cluster Abell 2877, located in the southern sky about 300 million light-years from Earth, astronomers discovered one such jellyfish. Visible only in a narrow band of radio light, the cosmic jellyfish is more than 1 million light-years across and includes a large lobe of crowded plasma from which tentacles of hot gas drip.
A giant jellyfish floats through space
The appearance of this jelly-like space structure is “ghostly” and “strange”. Even more surprising than the shape of this space jelly, however, is how quickly the structure disappears from view. While it is bright at normal FM radio frequencies, at a frequency of 200 megahertz its radiation is almost zero. No other similar extragalactic structure has yet been observed.
The universe is full of energy structures that are only visible at radio wavelengths. These include the mysterious X-shaped galaxies hurtling through space and the twin spots at the center of the Milky Way. However, no such large cosmic structure has yet been observed in such a narrow band of the radio spectrum.
According to scientists, this probably means that this space jellyfish is actually a strange bird known as a “radio phoenix”.
Scientists have never seen a stranger structure
Like the mythical bird that died in flames and rose again from the ashes, the radio phoenix is a cosmic structure that was born from a high-energy explosion. Same as a black hole explosion. It disappeared over millions of years as it expanded and its electrons lost energy. But in the end, she came to life again during another cosmic cataclysm. This could be, for example, the collision of two galaxies.
Scientists have no idea how it was formed
In order to create a radio phoenix, this last cosmic event must be strong enough. Only in this way will it send out shock waves that pass through the sleeping cloud of electrons, causing it to be compressed and the electrons to gain energy again. It could also cause a structure like a cluster of jellyfish to glow brightly at certain radio wavelengths but fade quickly at others.
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Source: Youtube
Colorful hummingbirds get their name from the buzzing sound their fast-moving wings make as they soar. These little aerodynamic marvels have the fastest wing beats of any bird, clocking in at around 70 beats per second. So more than 4000 per minute.
Scientists have created the first-ever 3D acoustic model of hummingbirds in flight, combining video and audio recordings of the birds in motion with measurements of the forces generated by hummingbird wings as they vibrate. The team deduced that the hummingbird sound is produced by the upward thrust of the hummingbird’s wings.
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There is an audible “hum” in most flying birds. This is created by the sound of the wings pulling down. It is a single beat of the wings that creates lift. In contrast, hummingbird wings, which form a “U” shape when flapping in the air, create lift on both the downstroke and the upstroke. At the speed at which hummingbird wings move, these activities and air pressure differences during wingbeats are the cause of hummingbird humming.
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