Astrophysics

(astronomy) the magnitude that a star would have if it were viewed from a distance of 10 parsecs (32.62 light years) from the earth

(astronomy) the formation of a celestial object by the effect of gravity pulling together surrounding objects and gases

(astronomy) apparent meeting or passing of two or more celestial bodies in the same degree of the zodiac

(astronomy) position of a planet as defined by its angular distance from its perihelion (as observed from the sun)

(astronomy) the point in an orbit farthest from the body being orbited

(astronomy) the rising of a star above the horizon

(astronomy) a cluster of stars (or a small constellation)

the branch of physics that studies celestial bodies and the universe as a whole

(astronomy) the equinoctial point that lies in the constellation of Virgo

(astronomy) the common center of mass around which two or more bodies revolve

(astronomy) an indistinct surface feature of Mars once thought to be a system of channels; they are now believed to be an optical illusion

(astronomy) the angular distance of a celestial body north or to the south of the celestial equator; expressed in degrees; used with right ascen…

(astronomy) the equatorial coordinate specifying the angle, measured eastward along the celestial equator, from the vernal equinox to the inters…

(astronomy) the luminous cloud of particles surrounding the frozen nucleus of a comet; forms as the comet approaches the sun and is warmed

(astronomy) a relatively small extraterrestrial body consisting of a frozen mass that travels around the sun in a highly elliptical orbit

(astronomy) apparent meeting or passing of two or more celestial bodies in the same degree of the zodiac

(astronomy) Copernicus' astronomical model in which the Earth rotates around the sun

(astronomy) a heavenly body's highest celestial point above an observer's horizon

(astronomy) an arbitrarily fixed date that is the point in time relative to which information (as coordinates of a celestial body) is recorded

(astronomy) the angular distance of a celestial body north or to the south of the celestial equator; expressed in degrees; used with right ascen…

(astronomy) the angular distance of a celestial body north or to the south of the celestial equator; expressed in degrees; used with right ascen…

(astronomy) the reappearance of a celestial body after an eclipse

(astronomy) the reappearance of a celestial body after an eclipse

(astronomy) a measure of time defined by Earth's orbital motion; terrestrial time is mean solar time corrected for the irregularities of the Ear…

(astronomy) an arbitrarily fixed date that is the point in time relative to which information (as coordinates of a celestial body) is recorded

(astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic

(astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic

(astronomy) a collection of star systems; any of the billions of systems each having many stars and nebulae and dust; "‘extragalactic nebula’ is…

(astronomy) a collection of star systems; any of the billions of systems each having many stars and nebulae and dust; "‘extragalactic nebula’ is…

(astronomy) the angular distance of a celestial point measured westward along the celestial equator from the zenith crossing; the right ascensio…

(astronomy) the angular distance of a celestial point measured westward along the celestial equator from the zenith crossing; the right ascensio…

(astronomy) the generalization that the speed of recession of distant galaxies (the red shift) is proportional to their distance from the observ…

(astronomy) the generalization that the speed of recession of distant galaxies (the red shift) is proportional to their distance from the observ…

(astronomy) the disappearance of a celestial body prior to an eclipse

(astronomy) the angle between the plane of the orbit and the plane of the ecliptic stated in degrees

(astronomy) the angle between the plane of the orbit and the plane of the ecliptic stated in degrees

(astronomy) the alignment of the Earth and a planet on the same side of the sun

(astronomy) the disappearance of a celestial body prior to an eclipse

(astronomy) one of three empirical laws of planetary motion stated by Johannes Kepler

(astronomy) one of three empirical laws of planetary motion stated by Johannes Kepler

(astronomy) a real or apparent slow oscillation of a moon or satellite; "the libration of the moon"

(astronomy) the circumferential edge of the apparent disc of the sun or the moon or a planet

(astronomy) any of the nine large celestial bodies in the solar system that revolve around the sun and shine by reflected light; Mercury, Venus,…

(astronomy) time based on the motion of the mean sun (an imaginary sun moving uniformly along the celestial equator)

(astronomy) time based on the motion of the mean sun (an imaginary sun moving uniformly along the celestial equator)

(astronomy) any of the small solid extraterrestrial bodies that hits the earth's atmosphere

(astronomy) any of the small solid extraterrestrial bodies that hits the earth's atmosphere

(astronomy) a point where an orbit crosses a plane

(astronomy) the cosmic synthesis of atoms more complex than the hydrogen atom

(astronomy) the center of the head of a comet; consists of small solid particles of ice and frozen gas that vaporizes on approaching the sun to…

(astronomy) a hypothetical huge collection of comets orbiting the sun far beyond the orbit of Pluto; perturbations (as by other stars) can upset…

(astronomy) the plane on which a body is orbiting

(astronomy) a major planet whose orbit is outside the asteroid belt (Jupiter, Saturn, Uranus, Neptune, Pluto)

(astronomy) the point in an orbit closest to the body being orbited

(astronomy) the particular appearance of a body's state of illumination (especially one of the recurring shapes of the part of Earth's moon that…

(astronomy) any of the nine large celestial bodies in the solar system that revolve around the sun and shine by reflected light; Mercury, Venus,…

(astronomy) the point in an orbit farthest from the body being orbited

(astronomy) the point in an orbit closest to the body being orbited

(astronomy) a celestial body (especially a star) relative to other objects in orbit around it

(astronomy) Ptolemy's model of the universe with the Earth at the center

(astronomy) the equatorial coordinate specifying the angle, measured eastward along the celestial equator, from the vernal equinox to the inters…

(astronomy) a shift in the spectra of very distant galaxies toward longer wavelengths (toward the red end of the spectrum); generally interprete…

(astronomy) a shift in the spectra of very distant galaxies toward longer wavelengths (toward the red end of the spectrum); generally interprete…

(astronomy) the equatorial coordinate specifying the angle, measured eastward along the celestial equator, from the vernal equinox to the inters…

(astronomy) a celestial body of hot gases that radiates energy derived from thermonuclear reactions in the interior

(astronomy) a series of star maps for different times, for example, for each month; the maps are generally drawn to a small scale and in book fo…

(astronomy) the alignment of the Earth and a planet on the opposite side of the sun

(astronomy) a measure of time defined by Earth's orbital motion; terrestrial time is mean solar time corrected for the irregularities of the Ear…

(astronomy) a measure of time defined by Earth's orbital motion; terrestrial time is mean solar time corrected for the irregularities of the Ear…

(astronomy) a measure of time defined by Earth's orbital motion; terrestrial time is mean solar time corrected for the irregularities of the Ear…

(astronomy) a measure of time defined by Earth's orbital motion; terrestrial time is mean solar time corrected for the irregularities of the Ear…

the branch of physics that studies celestial bodies and the universe as a whole

(astronomy) any perturbation of the mean motion or orbit of a planet or satellite (especially a perturbation of the earth's moon)

(astronomy) the equinoctial point that lies in the constellation of Pisces

the branch of astronomy concerned with the physical and chemical properties of celestial bodies

a region of space resulting from the collapse of a star; extremely high gravitational field

the quality of being luminous; emitting or reflecting light; "its luminosity is measured relative to that of our sun"

the quality of being luminous; emitting or reflecting light; "its luminosity is measured relative to that of our sun"

(cosmology) the cooled remnant of the hot big bang that fills the entire universe and can be observed today with an average temperature of about…

(cosmology) the cooled remnant of the hot big bang that fills the entire universe and can be observed today with an average temperature of about…

(cosmology) the cooled remnant of the hot big bang that fills the entire universe and can be observed today with an average temperature of about…

(cosmology) the cooled remnant of the hot big bang that fills the entire universe and can be observed today with an average temperature of about…

(cosmology) the cooled remnant of the hot big bang that fills the entire universe and can be observed today with an average temperature of about…

(cosmology) the cooled remnant of the hot big bang that fills the entire universe and can be observed today with an average temperature of about…

(cosmology) a hypothetical form of matter that is believed to make up 90 percent of the universe; it is invisible (does not absorb or emit light…

the quality of being luminous; emitting or reflecting light; "its luminosity is measured relative to that of our sun"

the quality of being luminous; emitting or reflecting light; "its luminosity is measured relative to that of our sun"

the quality of being luminous; emitting or reflecting light; "its luminosity is measured relative to that of our sun"

the quality of being luminous; emitting or reflecting light; "its luminosity is measured relative to that of our sun"

a star that has collapsed under its own gravity; it is composed of neutrons

a star that explodes and becomes extremely luminous in the process

a faint star of enormous density

a faint star of enormous density

the branch of astrophysics that studies the origin and evolution and structure of the universe

the branch of astrophysics that studies the origin and evolution and structure of the universe

the branch of astrophysics that studies the origin and evolution and structure of the universe

apoapsis in solar orbit; the point in the orbit of a planet or comet that is at the greatest distance from the sun

apoapsis in Earth orbit; the point in its orbit where a satellite is at the greatest distance from the Earth

apoapsis in orbit around Jupiter

apoapsis in orbit around the moon

apoapsis in orbit around the moon

the point at which an orbit crosses the ecliptic plane going north

the branch of astronomy that studies the motion of natural and artificial bodies in space

the branch of astronomy that deals with the measurement of the position and motion of celestial bodies

a system of two stars that revolve around each other under their mutual gravitation

a system of two stars that revolve around each other under their mutual gravitation

the branch of astronomy concerned with the application of Newton's laws of motion to the motions of heavenly bodies

a planet (usually Venus) seen just before sunrise in the eastern sky

the point at which an orbit crosses the ecliptic plane going south

a system of two stars that revolve around each other under their mutual gravitation

any star in the Ptolemaic theory of planetary motion

any of the four outermost planets in the solar system; much larger than Earth and gaseous in nature (like Jupiter)

a very bright star of large diameter and low density (relative to the Sun)

a very bright star of large diameter and low density (relative to the Sun)

a massive grouping of galaxies in the direction of Centaurus and Hydra whose gravitational attraction is believed to cause deviations in the pat…

a law stating that the ratio of the square of the revolutionary period (in years) to the cube of the orbital axis (in astronomical units) is the…

any of the planets whose orbit lies inside the earth's orbit

any of the four outermost planets in the solar system; much larger than Earth and gaseous in nature (like Jupiter)

a law stating that the orbit of each planet is an ellipse with the sun at one focus of the ellipse

a law concerning the speed at which planets travel; a line connecting a planet to the sun will sweep out equal areas in equal times; "Kepler's s…