relativistic effect
21Thomas precession — In physics the Thomas precession, named after Llewellyn Thomas, is a special relativistic correction to the precession of a gyroscope in a rotating non inertial frame. It can be understood as a consequence of the fact that the space of velocities …
22Speed of gravity — In the context of classical theories of gravitation, the speed of gravity refers to the speed at which a gravitational field propagates. This is the speed at which changes in the distribution of energy and momentum result in noticeable changes in …
23Vacuum tube — This article is about the electronic device. For experiments in an evacuated pipe, see free fall. For the transport system, see pneumatic tube. Modern vacuum tubes, mostly miniature style In electronics, a vacuum tube, electron tube (in North… …
24Lanthanide contraction — is a term used in chemistry to describe different but closely related concepts associated with smaller than expected ionic radii of the elements in the lanthanide series (atomic number 58, Cerium to 71, Lutetium).CauseVery simply, the effect… …
25Space colonization — Artist Les Bossinas 1989 concept of Mars mission Space colonization (also called space settlement, space humanization, or space habitation) is the concept of permanent human habitation outside of Earth. Although hypothetical at the present time,… …
26Neutron-star oscillation — Asteroseismology studies the internal structure of our Sun and other stars using oscillations. These can be studied by interpreting the temporal frequency spectrum acquired through observations[1]. In the same way, the more extreme neutron stars… …
27Gyrotron — Gyrotrons are high powered vacuum tubes which emit millimeter wavelength beams by bunching electrons with cyclotron motion in a strong magnetic field. Output frequencies range from about 20 to 250 GHz, covering wavelengths from microwave to the… …
28Atomic radius — Diagram of a helium atom, showing the electron probability density as shades of gray. The atomic radius of a chemical element is a measure of the size of its atoms, usually the mean or typical distance from the nucleus to the boundary of the… …
29Problematic physics experiments — Experimental science demands repeatability of results, in part because there are so many ways that experiments can go wrong. There are several famous experiments whose results were later retracted or discredited. The most common problem is simply …
30GRS 1915+105 — or V1487 Aquilae Observation data Epoch J2000.0      Equinox J2000.0 Constellation Aquila Right ascension 19h 15m 11.6s Declination +10° 56 4 …
