5 Written questions
5 Matching questions
- The chemical makeup of a star's surface is usually inferred by
- When a solid body (or a dense gas such as a star) cools from a temperature of several thousand degrees, the color of the wavelength of maximum emission of radiation will
- According to Newton's laws, a for must be acting whenever
- Why were Newton's three laws so important to astronomy?
- A perfect circle is an ellipse with an eccentricity of
- a the direction of an object's motion changes.
- b move steadily toward the red end of the spectrum.
- c Newton's laws showed that planets can move around the Sun by themselves forever, without coming to rest.
- d spectroscopy of the light emitted by the star.
- e zero.
5 Multiple choice questions
- at all wavelengths, with a peak at one particular wavelength (color).
- its synodic period.
- The air molecules scatter blue light better than red light, so more blue light reaches our eyes.
- distance that light travels in one year.
- time needed for half the radioactive atoms in the sample to decay.
5 True/False questions
In the 1860s, James Clerk Maxwell carried out important investigations on the nature of light when he → demonstrated that white light was made up of colors that could be split by a prism and that these colors were not produced by the glass through which the light passed.
The declination of a star in the sky is defined as the angle between the → celestial equator and the star, measured along a great circle passing through both celestial poles.
In the geocentric model of the solar system developed by Ptolemy, the planets move → in circular epicycles while the centers of the epicycles move in circular orbits around the Earth.
If a modern astronomer describes a faint star as being in the constellation Cygnus, the Swan, you know that the star is → celestial equator and the star, measured along a great circle passing through both celestial poles.
The term retrograde motion from a planet refers to the → temporary reversal of the planet's normal west-to-east motion past the background stars as seen from the Earth.