5 Written questions
5 Matching questions
- What is the main reason for using several radio telescopes together as an interferometer?
- The best shape for the cross-section of a simple astronomical mirror in order to produce the sharpest images of very distant objects at its prime focus is a(n)
- In the system of celestial coordinates that matches latitude and longitude on the Earth, which in the coordinate that is equivalent to latitude?
- The chemical makeup of a star's surface is usually inferred by
- In the 1860s, James Clerk Maxwell carried out important investigations on the nature of light when he
- a proved mathematically that light could b described by oscillating electric and magnetic fields.
- b parabolic shape.
- c to obtain much better angular resolution or sharpness in the images.
- d spectroscopy of the light emitted by the star.
- e declination
5 Multiple choice questions
- path traced out by the Sun in our sky over one year against the background stars.
- time needed for half the radioactive atoms in the sample to decay.
- Yes, On a summer night many of the constellation you can see are different from the constellations you can see on a winter night. But there are some constellations you can see all year long.
- celestial equator and the star, measured along a great circle passing through both celestial poles.
5 True/False questions
The position of an element in the periodic table is directly related to the → temporary reversal of the planet's normal west-to-east motion past the background stars as seen from the Earth.
The zero point of the celestial coordinate known as right ascension is defined to be the → point where the Sun crosses the celestial equator moving northward in its path across the sky.
Why was adaptive optics developed? → The air molecules scatter blue light better than red light, so more blue light reaches our eyes.
According to Kirchoff's law, the continuous spectrum of light from a hot star, after passing through a cool gas cloud, → shows absorption features where light has been absorbed by the atoms of the cool gas.
One light-year is the → distance that light travels in one year.