< Stars‎ | Oranges

Orange stars is a lecture from the radiation astronomy department for possible inclusion in the course on the principles of radiation astronomy and is already in the star courses.

This is a wide-field image in the region of NGC 3603 taken on the ground by the Digitized Sky Survey 2. Credit: NASA, ESA, and the Digitized Sky Survey 2.

You are free to take this quiz based on orange stars at any time.

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Quiz edit


1 True or False, Oxygen emissions can be green or brownish-red depending on the amount of energy absorbed.


2 Which of the following is not a phenomenon associated with green astronomy?

a stellar class G dwarf
the hydrogen Balmer beta line
the photosphere of the Sun
an emission with a wavelength of 618 nm
"ionization cones"
boron ion emission

3 True or False, Hydrogen has an emission line in the orange.


4 Phenomena associated with some brown dwarfs are which of the following?

a temperature well below the stellar range
methane absorption
the lithium test
T dwarfs

5 True or False, Lithium has an orange line at about 671 nm.


6 Which of the following are phenomena associated with the orange system?

a number of emission lines very close together
many impact craters on Io

7 True or False, PTF 10fqs is brighter than a nova, but fainter than a supernova.


8 Historically, orange astronomy is not known for which of the following?

Alpha Centauri B
Epsilon Eridani
K spectral type stars
the Bayer designation for a star
the Indian city of Pondicherry in December 1689

9 Yes or No, The orange portion of the visible spectrum is from 590 to 620 nm in wavelength.


10 Complete the text:

Match up the radiation letter with each of the detector possibilities below:
Optical rays - L
Visual rays - M
Violet rays - N
Blue rays - O
Cyan rays - P
Green rays - Q
Yellow rays - R
Orange rays - S
Red rays - T
multialkali (Na-K-Sb-Cs) photocathode materials



broad-band filter centered at 404 nm


thallium bromide (TlBr) crystals


18 micrometers FWHM at 490 nm

wide-gap II-VI semiconductor ZnO doped with Co2+ (Zn1-xCoxO)


11 True or False, Fluorine has a number of lines in the orange.


12 The atmosphere of Titan which has a natural orange color is composed largely of?

13 True or False, Ultraviolet radiation from young massive stars carves and heats the surfaces of cold hydrogen gas clouds. The warmed surfaces glow orange and red.


14 Which orange astronomy phenomena are associated with globular clusters?

a yellow-orange filter (F606W)
many older K-type stars
spherical collection of stars
orbit the cores of galaxies
some of the more ancient stars

15 True or False, Of some 824 red giant stars, lithium is detected in several stars.


16 The orange band from molecular calcium chloride is observed in the spectra of many stars of what type?

17 Complete the text:

The orange and brown coloration in the clouds of

are caused by

compounds that change color when they are exposed to

light from the Sun.

Hypotheses edit

  1. Orange stars reveal details otherwise not available at other wavelengths.

See also edit

External links edit

{{Principles of radiation astronomy}}