Exam 23: Light,astronomical Observations,and the Sun

The first telescopes,and most amateur telescopes,rely on the human eye to observe objects.The first improvement on this observation method used ________.

Visible light emitted from the celestial bodies is only a small part of an array of energy called ________ radiation.

Which of the following colors has the longest wavelength?

Blue stars are cooler than red stars.

You take a block of granite and heat it to 1000 degrees Kelvin,and it glows bright red.If you then heat it to 1200 Kelvin,how might it look different?

The most conspicuous features on the surface of the Sun are dark areas called ________.

The nuclear reaction process of converting hydrogen nuclei into helium nuclei is called the ________ chain.

A solar telescope would quickly incinerate your eyes,so how do astronomers save their eyes when looking at the Sun?

Although current technology will allow the construction of much larger optical telescopes,astronomers see no advantage in building these larger instruments.

The amount of energy released during a nuclear reaction was established by ________.

The first telescopes,and most amateur telescopes,rely on the human eye to observe objects.Modern telescopes record the observations with ________.

To determine whether a celestial body is approaching or receding from Earth,astronomers employ ________.

The source of the Sun's energy is ________.

As the temperature of a radiating surface is increased ________.

Radio telescopes have an advantage over optical telescopes in that they can be used during daylight hours.

Visible light is a small part of the electromagnetic spectrum,but when we see colors,we are seeing ________.