The most common relative directions are left, right, forward(s), backward(s), up, and down. No absolute direction corresponds to any of the relative directions. This is a consequence of the translational invariance of the laws of physics: nature, loosely speaking, behaves the same no matter what direction one moves. As demonstrated by the Michelson-Morley null result, there is no absolute inertial frame of reference. There are definite relationships between the relative directions, however. Left and right, forward and backward, and up and down are three pairs of complementary directions, each pair orthogonal to both of the others. Relative directions are also known as egocentric coordinates.[1]
as related to orientations in space and the up quark
The up quark or u quark (symbol: u) is the lightest of all quarks, a type of elementary particle, and a major constituent of matter. It, along with the down quark, forms the neutrons (one up quark, two down quarks) and protons (two up quarks, one down quark) of atomic nuclei. It is part of the first generation of matter, has an electric charge of +2/3 e and a bare mass of 2.3+0.7
−0.5 MeV/c2.[1]. Like all quarks, the up quark is an elementary fermion with spin 1/2, and experiences all four fundamental interactions: gravitation, electromagnetism, weak interactions, and strong interactions. The antiparticle of the up quark is the up antiquark(sometimes called antiup quark or simply antiup), which differs from it only in that some of its properties, such as charge have equal magnitude but opposite sign.
Its existence (along with that of the down and strange quarks) was postulated in 1964 by Murray Gell-Mann and George Zweig to explain the Eightfold Wayclassification scheme of hadrons. The up quark was first observed by experiments at the Stanford Linear Accelerator Center in 1968.
from
scientific explorer.
image credit
videoblock
The up and down are obvious.
videoblock
The up and down are obvious.
wikipedia
date 2019
February 1
The down quark or d quark (symbol: d) is the second-lightest of all quarks, a type of elementary particle, and a major constituent of matter. Together with the up quark, it forms the neutrons (one up quark, two down quarks) and protons (two up quarks, one down quark) of atomic nuclei. It is part of the first generationof matter, has an electric charge of −1/3 e and a bare mass of 4.8+0.5
−0.3 MeV/c2.[1] Like all quarks, the down quark is an elementary fermion with spin 1/2, and experiences all four fundamental interactions: gravitation, electromagnetism, weak interactions, and strong interactions. The antiparticle of the down quark is the down antiquark (sometimes called antidown quark or simply antidown), which differs from it only in that some of its properties have equal magnitude but opposite sign.
Its existence (along with that of the up and strange quarks) was postulated in 1964 by Murray Gell-Mann and George Zweig to explain the Eightfold Wayclassification scheme of hadrons. The down quark was first observed by experiments at the Stanford Linear Accelerator Center in 1968.
credit
hyperphysics
date 2019
February 1
The down quark or d quark (symbol: d) is the second-lightest of all quarks, a type of elementary particle, and a major constituent of matter. Together with the up quark, it forms the neutrons (one up quark, two down quarks) and protons (two up quarks, one down quark) of atomic nuclei. It is part of the first generationof matter, has an electric charge of −1/3 e and a bare mass of 4.8+0.5
−0.3 MeV/c2.[1] Like all quarks, the down quark is an elementary fermion with spin 1/2, and experiences all four fundamental interactions: gravitation, electromagnetism, weak interactions, and strong interactions. The antiparticle of the down quark is the down antiquark (sometimes called antidown quark or simply antidown), which differs from it only in that some of its properties have equal magnitude but opposite sign.
Its existence (along with that of the up and strange quarks) was postulated in 1964 by Murray Gell-Mann and George Zweig to explain the Eightfold Wayclassification scheme of hadrons. The down quark was first observed by experiments at the Stanford Linear Accelerator Center in 1968.
credit
hyperphysics
image credit
wikipedia.
wikipedia.
image credit
Theatlantic.com
The left and right sides are observable as the Earth to the observer of the astronaut being to the left and space outside Earths atmosphere layer to the left.
The image of an astronaut looking forwards has the same way to define the left and right hemispheres of the brain as we do on Earth ,much like looking up at the sky to observe the Sun. So too do astronauts observe the position of the Sun as relative to the left side with the Earths day side being on the side to the right between the Earth's left side.
Theatlantic.com
The left and right sides are observable as the Earth to the observer of the astronaut being to the left and space outside Earths atmosphere layer to the left.
The image of an astronaut looking forwards has the same way to define the left and right hemispheres of the brain as we do on Earth ,much like looking up at the sky to observe the Sun. So too do astronauts observe the position of the Sun as relative to the left side with the Earths day side being on the side to the right between the Earth's left side.
How to define the left and right sides from the position of space as in Earth orbit.
You may observe that the Earth in the background of the astronaut is curved at an angle. This may be due to the Earth's tilt.
image credit
blogs.nasa.gov
You may observe that the Earth in the background of the astronaut is curved at an angle. This may be due to the Earth's tilt.
image credit
blogs.nasa.gov