Despite its proximity, Venus remains largely mysterious, thanks to its cloudy atmosphere and incredible harsh conditions. A recent study using data from the Japanese satellite Akatsuki revealed an enormous bow-shaped wave in the Venusian atmosphere. The wave appeared at an altitude of about 65 km and stretched more than 10,000 km long, across both the northern and southern hemispheres. Although surface winds on Venus are believed to be small due to its incredibly slow rotation, winds higher in the atmosphere are much faster – so it was strange to observe this wave sitting essentially stationary for five days of observation.
When the scientists mapped the location of wave relative to the surface, they found it was sitting over the Aphrodite Terra highlands, suggesting that this structure is a gravity wave generated by winds interacting with the topography. Similar, albeit smaller, gravity waves are often observed on Earth near mountains. The finding raises questions about our understanding of Venusian atmospheric dynamics and exactly how disturbances from surface winds could create enormous structures so high in the atmosphere. (Image credit: T. Fukuhara et al.; h/t to SciShow Space)
Double refraction of
light through crystalline structures, demonstrated by Sir Lawrence Bragg in 1965.
If you look through glass at some writing, you’ll be able to
see it clearly, as normal. But if you look through a clear crystal, like
calcite, you’ll see two overlapping images. This is because of the crystal
When light enters water or glass, it slows down uniformly. When it
enters a crystal, with it’s very regular pattern, the light is affected differently in two different directions, rather than uniformly in all directions. As a result, the light will split into two
beams, travelling at different speeds. This difference in speed means the beams
bend, or refract, differently, resulting in two distinct images.
Here, Bragg rotates a polarised sheet above the crystal
to reveal only one orientation at a time, showing each image separately
I regard the essence of the notion of process as given by the statement: Not only is everything changing, but all is flux. That is to say, what is is the process of becoming itself, while all objects, events, entities, conditions, structures, etc. are forms that can be abstracted from this process.
“The Hertz wave theory of wireless transmission may be kept up for a while, but I do not hesitate to say that in a short time it will he recognized as one of the most remarkable and inexplicable aberrations of the scientific mind which has ever been recorded in history.”
“The True Wireless.”Electrical Experimenter, May 1919.
20/02/2017~~ Yo, wassup everyone? I’m so tired rn ㅠㅠ… Tomorrow is my friend’s birthday so I went to the bookshop to buy 2 books for her (they are so cool omg). Because of this I missed the bus so I had to take the next one and I got a bit late home. I studied for my physics test tho so that’s great!
(I’m planning to make loads of helpful posts next week (vacation yeeey) so please, stay tuned!)
The science community pushed for Rubin to get a Nobel Prize, hoping she’d break a more than 50-year streak without a female winner, according to The Washington Post. One supporter of this movement, University of Washington astronomer Emily Levesque, told Astronomy.com that “the existence of dark matter has utterly revolutionized our concept of the universe and our entire field; the ongoing effort to understand the role of dark matter has basically spawned entire subfields within astrophysics and particle physics at this point.”