Show:
Telescopes
Stars
People
Constellations
Tools
100
a combination of a primary concave mirror and a secondary convex mirror, often used in optical telescopes and radio antennas.
What is cassegrain reflector
100
a region of space having a gravitational field so intense that no matter or radiation can escape
What is Black Hole
100
who was the first person to build a telescope?
What is Galileo Galilei
100
How many modern constellations are there?
What is 88
100
the projecting piece on a sundial that shows the time by the position of its shadow.
What is Gnomon
200
A telescope that uses only lenses to concentrate the light from an object
What is refractor telescope
200
stars brightness is measured by what?
What is magnitude
200
who was one of the first to investigate the use of lenses?
What is Roger Bacon
200
what is before the name of the brightest stars
What is Alpha
200
what was used to read the angle of a star made with the horizon
What is Octants
300
uses a concave mirror as the primary light-gathering optical component
What is reflector telescope
300
a cloud of gas and dust
What is nebula
300
who stated an orderly system for identifying certain stars in a constellation
What is Johann Bayer
300
a group of stars that make up a shape
What is Constellation
300
first clock that didn't need the sun to work
What is Water clock
400
Uses radio waves to collect information
What is Radio Telescope
400
consists of millions of stars
What is Galaxy
400
who was the first person to credibility invent the telescope
What is Hans Lipperhey
500
an instrument that creates optical and non optical categories of telescopes
What is Hubble space telescope
500
a star that is visible for a period of time
What is Nova