A telescope that uses only lenses to concentrate the light from an object and focus it into an image.
What is a refractor telescope?
100
The lens nearest the object in a compound optical instrument. In astronomy, the large, light-gathering lens of a refractor telescope.
What is an objective lens?
100
A term used to classify the largest and most luminous stars. Typically they are 15-20 times as massive as our sun, but they are several hundred times as large and are much more luminous.
What is a Super Giant?
100
One of the first people to investigate the use of lenses.
Who is Roger Bacon?
100
Celestial latitude. Angular distance north or south of the celestial equator measured in degrees.
What is Declination?
200
Any one of several telescope designs that uses a concave mirror as the primary light-gathering optical component
What is a reflector telescope?
200
Two or more lenses made of different kinds of glass mounted together to correct for chromatic aberration.
What are compound lenses?
200
A very dense, very bright star of about the same mass as the sun but only about a hundredth of its diameter. White dwarfs in binary systems may produce novas. Some may be remnants of supernovas.
What is a White Dwarf?
200
Made the first telescopes to appear in Holland in 1608.
Who is Hans Lipperhey?
200
Celestial longitude; measured in hours, minutes, and seconds east of the prime hour circle.
What is Right Ascension?
300
A telescope that uses both a primary mirror and a large objective corrective lens as the main light-gathering elements of the telescope.
What is a composite telescope?
300
The eyepiece of an optical instrument such as a telescope.
What is ocular
300
Two stars revolving around each other such that they periodically pass in front of each other relative to the observer.
What is an Eclipsing Binary?
300
Introduced an orderly system for identifying particular stars within a constellation.
Who is Johann Bayer?
300
The reference line for celestial longitude, extending from the north to the south celestial poles through the point of the vernal equinox. (See vernal equinox.) Position of zero hours of right ascension.
What is the Prime Hour Circle?
400
A radio receiver with a large, dish-shaped antenna system. It receives, focuses, and amplifies, and analyzes radio waves from outer space.
What is a radio telescope?
400
The ability of lens or mirror to visually separate two objects that are separated by a small angle.
What is resolution?
400
a type of star that changes in brightness regularly, apparently because it expands and contracts on a regular basis.
What are Cepheid Variables?
400
Was the first astronomer to detect proper motion.
Who is Edmund Halley?
400
The day that the sun’s overhead noon position crosses the equator (March 21). At the equinox, day and night are of equal length in all parts of the earth.
What is the Vernal Equinox?
500
An astronomical reflecting telescope place in earth's orbit by the space shuttle in 1990. The HST has provided amazing images of the universe that changed the course of astronomy.
What is the Hubble Space Telescope?
500
In general the bending of a wave when it changes speed because the material through which it is moving changes in some way. It occurs in optics when light passes from air into glass and in water waves when the bottom becomes shallower than the wave base.
What is refraction?
500
A star that suddenly increases its apparent brightness by about twenty magnitudes because of an explosion that essentially destroys it.
What is a supernova?
500
drew up a catalog of one hundred star clusters (didn’t know they were star clusters)
Who is Charles Messier?
500
The measure of the brightness of a star; a measure of the amount of energy released by an earthquake.