What is the Strangelet problem?
A strangelet is a hypothetical particle consisting of a bound state of roughly equal numbers of up, down, and strange quarks. Strangelets can convert matter to strange matter on contact. Strangelets have been suggested as a dark matter candidate.
What happens when strange matter touches something?
As physicist Edward Farhi described it, “A lump of strange matter has an insatiable appetite for neutrons and grows fat by eating them.” Anything coming into contact with the border of strange matter would be consumed by it, altered at a subatomic level until the normal matter itself became strange.
Does dark matter exist?
Scientists know that dark matter does not emit light from any part of the electro-magnetic spectrum, but dark matter has been observed to be influenced by gravity. Astrophysicists are still unsure what dark matter is, exactly. We know that dark matter makes up ~80% of the total mass of galaxies [2].
What do top and bottom quarks do?
However, once produced, the top (or antitop) can decay only through the weak force. It decays to a W boson and either a bottom quark (most frequently), a strange quark, or, on the rarest of occasions, a down quark….Top quark.
| A collision event involving top quarks | |
|---|---|
| Composition | Elementary particle |
| Color charge | Yes |
| Spin | 12 |
| Topness | 1 |
Are leptons baryons?
The best known baryons are the protons and neutrons that make up most of the mass of the visible matter in the universe, whereas electrons, the other major component of atoms, are leptons. Each baryon has a corresponding antiparticle known as an antibaryon in which quarks are replaced by their corresponding antiquarks.
How can I get the list of earthquakes?
Clicking the list icon in the top right corner will load the earthquake list. Clicking the map icon in the top right corner will load the map. Clicking the options icon in the top right corner lets you change which earthquakes are displayed, and many other map and list options.
Where was the 3.6 earthquake in South Africa?
A 3.6 magnitude earthquake was felt in Johannesburg. Here’s what we know. The tremor took place at 6:34 SAST on Friday, 30 July, in Kathlehong. The hypocentre depth was 10 kilometres.
Where did the earthquake hit in South Alaska?
According to the USGS, the earthquake hit 91km southeast of the town of Perryville, with a tsunami warning in effect for south Alaska and the Alaskan peninsula. Videos shared on social media showed Kodiak residents evacuating to higher ground while tsunami warning sirens were heard blasting in the background.