That has been added to it if an object is not a blackbody radiator, it will not The temperature of an object if it is re-radiating all the thermal energy
I at a particular energy E is given by Plank's law: Perfect absorbers must also be perfect radiators.įor a blackbody at a temperature T, the intensity of radiation emitted Thermodynamics, with the surface areas of the black holes being aīlackbody radiation is produced by an object which is a perfectĪbsorber of heat. Normal matter, the sum of the surface areas of all black holes involved can With black-hole interactions, or interactions between black holes and
This is analogous to the first law of thermodynamics. Laws of mass-energy, electric charge, linear momentum, and angular Has radiated all its energy or gas which has contracted but containsĪn object whose gravity is so strong that not even light can escapeīlack-hole dynamic laws laws of black-holeįor interactions between black holes and normal matter, the conservation The normal star to the compact star star, producing X-rays in the process.Ī non-radiating ball of gas resulting from either a white dwarf that Such as a white dwarf, neutron star, or black hole, and the separationīetween the stars is small enough so that matter is transferred from X-ray binary is a special case where one of the stars is a collapsed object Presumed to have begun with a primeval explosion (referred to asīinary stars are two stars that orbit around a common center of mass. The Broad Band X-Ray Telescope, which was flown on the Astro-1 spaceĪ theory of cosmology in which the expansion of the universe is Their presence in the universe is determined through their gravitational and electromagnetic interactions.īATSE (Burst and Transient Source Experiment) is an instrument aboard theĬompton Gamma Ray Observatory that detects and Most commonly, these are protons and neutrons. They were discovered by Swiss physicistĪny of the subatomic particles which interact via the strong nuclear force. Transitions between the second (or first excited) state and higher energy X-ray Observatory, CXO, and launched in July 1999.Įmission or absorption lines in the spectrum of hydrogen that arise from The Advanced X-ray Astrophysics Facility. Mostly nitrogen, while the Sun's atmosphere consists of mostly hydrogen. The part of astronomy that deals principally with the physics of stars, stellar The scientific study of matter in outer space, especially the positions,ĭimensions, distribution, motion, composition, energy, and evolution of Astro E was destroyed in February 2000, when a Japanese M-5 rocket failed to lift the instrument into orbit.ġ49,597,870 km the average distance from the Earth to the Sun. Many high-energy satellites have carried ASM detectors,Ī X-ray/gamma-ray mission built jointly by the United States and Intensity of many sources across the sky and looks for new sources. Sky for interesting astronomical phenomena. An instrument designed to observe large areas of the Pronunce 'Asuka' in Japanese, means flying bird. Opposite ofįourth Japanese X-ray Astronomy satellite, previously known as Astro-D. Special namesĪre given to this orbital point for commonly used systems: seeĪn Earth satellite is farthest from the Earth. The point in an orbit when the two objects are farthest apart. Separation between two stars which are in orbit around each other.Ī planet is farthest from the Sun. Orbits travel faster at periastron and more slowly at apastron.Ī spinning body also possesses spin angular momentum. Since the mass is constant, the velocity changes. If the orbit is elliptical the radius will vary. Must remain constant at all points in the orbit, i.e., it cannot beĬreated or destroyed. The conservation laws of physics, the angular momentum of any orbiting body Orbiting body by its velocity and the radius of its orbit. This may also beĪ quantity obtained by multiplying the mass of an Supermassive black holes may lie at the center of these galaxies andĪ unit of length equal to 0.00000001 centimeters. Hole, or any massive object growing in size by attracting material.Ī class of galaxies which spew massive amounts of energy from theirĬenters, far more than ordinary galaxies.
(Note - Greek letters are written out by name - alpha, beta etc.)Īccumulation of dust and gas onto larger bodies such as stars, planets andĪ relatively flat sheet of gas and dust surrounding a newborn star, a black This glossary is obtained from Imagine the Universe!, a service of Goddard
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