Stars grouped into patterns
A device that determines the position and motion of the heavenly bodies
Sextant and octant were handheld instruments having a movable index arm that indicated the angle of elevation between a star the sun or moon and the horizon
The telescope Galileo Galilei invented
Make (a ray of light) change direction when it enters at an angle.
the lens or system of lenses in a telescope or microscope that is nearest the object being viewed.
Eye piece or magnifying lens
The ability of a telescope to bring out details in an image
A slightly different angle of refraction in a given lens
Moderns refractors avoid chromatic aberration by using special lenses consisting of two different kinds of glass cemented together
Telescope that Sir Issac Newton created
The arrangement in which the image is viewed through the side of a tube
A more compact reflector telescope design that is easier to use
A telescope that uses both mirrors and correcting objective lens to gather light
In this form the light path enters the telescope through a special lens and then continues through a hole in the main mirror as with a standard cassegrainian
An instrument used to detect radio emissions from the sky, whether from natural celestial objects or from artificial satellites
Hubble space telescope
A special instrument that spans the optical and nonoptical categories of telescopes
The astronomical equivalent of latitude and longitude
When the heavens are divided into northern and southern halves
A stars angular distance north or south of the celestial equator
A stars longitudinal position
Prime hour circle
The starting line for right ascension
A measure of its relative brightness
The mathematical rule that relates the stretching of wavelengths of their light with increasing distances
Movements across the sky as we see it
Movement directly toward or away from us
The color of a star
A red star that is five times larger than the sun
Some very hot blue white stars are that are relatively small
Variable star pairs like Agol
Stars that expand and contract regularly
How long a star takes to go from one bright spurt to the next
Occasionally a star may increase it brightness by twenty magnitudes or more in an explosion that practically destroys the star
A star that will be visible for several month or years that no one has recorded then it will fade away
An extremely dense small dark star in which atomic particles (electrons and protons) have combined to from neutrons
Several stars that have the same motions
Consists of millions of stars
The many types of objects that Messier and Dreyer cataloged which are clouds of gas and or dust
A massive and extremely remote celestial object, emitting exceptionally large amounts of energy and typically having a starlike image in a telescope
The most mysterious and unusual objects in the universe.
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