Accumulation of dust and gas into larger bodies such as stars, planets and moons.
The ratio of the amount of light reflected by an object and the amount of incident light; a measure of the reflectivity or intrinsic brightness of an object (a white, perfectly reflecting surface ...
The point that is directly on the opposite side of the planet
The point in its orbit where a planet is farthest from the sun; when refering to objects orbiting the earth the term apogee is used; the term apoapsis is used for orbits around other bodies. (oppo...
Having the form of a bow; curved; arc-shaped
(also "planetoid") a medium-sized rocky object orbiting the sun; smaller than a planet, larger than a meteoroid
Asteroids are assigned a serial number when they are discovered. it has no particular meaning except that asteroid n+1 was discovered after asteroid n. (see appendix 5)
= 1.013 bars = 1.03 kg/cm2 = 14.7 pounds per square inch, standard atmospheric pressure at sea level on earth.
= 0.987 atmosphere = 1.02 kg/cm2 = 100 kilopascal = 14.5 lbs/square inch.
A fireball that produces a sonic boom
Crater formed by an explosion or collapse of a volcanic vent.
A compound containing carbon and oxygen (i.e. calcium carbonate a.k.a. limestone).
Chain of craters.
Hollow, irregular depression.
Distinctive area of broken terrain.
The lower level of the solar atmosphere between the photosphere and the corona
Small hills or knobs.
A medium-sized icy object orbiting the sun; smaller than a planet
The legislative branch of the us government; has proven to be a much more hostile environment for scientific spacecraft than the vastness of space.
- Ovoid-shaped feature.
- The uppermost level of the solar atmosphere, characterized by low densities and high temperatures (> 1.0e+06° k).
A special telescope which blocks light from the disk of the sun in order to study the faint solar atmosphere.
An extremely energetic (relativistic) charged particle.
Bowl-shaped depression formed by the impact of a meteorite; depression around the orifice of a volcano.
Measured in grams per cubic centimeter (or kilograms per liter); the density of water is 1.0; iron is 7.9; lead is 11.3.
Large reptiles that lived in the mesozoic era from 230 to 65 million years ago; most probably wiped out by the impact of a large asteroid or comet.
Literally "bad stars"; particularly apt in reference to a major asteroid impact.
The visible surface of the sun (or any heavenly body) projected against the sky.
The apparent change in wavelength of sound or light caused by the motion of the source, observer or both. (see also)
A relative quiet volcanic eruption which puts out basaltic lava that moves at about the speed one walks; the lava is fluid in nature; the eruptions at the kilauea volcano on the island of hawaii a...
Oval. that the orbits of the planets are ellipses, not circles, was first discovered by johannes kepler based on the careful observations by tycho brahe.
= 1e-10 kilowatts.
The eccentricity of an ellipse (planetary orbit) is the ratio of the distance between the focii and the major axis. equivalently the eccentricity is (ra-rp)/(ra+rp) where ra is the apoapsis distan...
A dramatic volcanic eruption which throws debris high into the air for hundreds of miles; lava is low in silicate; can be very dangerous for people near by; an example is mount st. helens in 1980<...
"1.23e4" means "1.23 times 10 to the fourth power" or 12,300; "5.67e-8" means "5.67 divided by 10 to the eighth power" or 0.0000000567.
A strand of cool gas suspended over the photosphere by magnetic fields, which appears dark as seen against the disk of the sun; a filament on the limb of the sun seen in emission against the dark ...
A meteor brighter than magnitude -3
A sudden eruption of energy on the solar disk lasting minutes to hours, from which radiation and particles are emitted.
Cuspate (pointed) linear feature.
Long, narrow, shallow depression.