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The Hubble Space Telescope image shows four high-velocity, runaway stars plowing through their local interstellar medium. Credit: NASA - Hubble's Advanced Camera for Surveys.

Blue stars is a lecture from the radiation astronomy department for the star courses.

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

To improve your scores, read and study the lecture, the links contained within, listed under See also, External links, and in the {{stars resources}} template. This should give you adequate background to get 100 %.

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Enjoy learning by doing!

Quiz

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1 True or False, In 1947, G. E. Kron proposed that starspots were the reason for periodic changes in brightness on blue dwarfs.

TRUE
FALSE

2 Phenomena associated with the color index?

a simple numerical expression
the magnitude of an object
a set of passbands or filters
brightenings
UBVRI filters
particular combinations of glass filters and photomultiplier tubes

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

TRUE
FALSE

4 Which of the following are radiation astronomy phenomena associated with a star?

ultraviolet emission
X-ray emission
gamma-ray emission
neutron emission
7Be emission
meteor emission

5 Yes or No, Helium has an emission line in the blue.

Yes
No

6 Which series of emission lines from hydrogen often occur in the visible spectrum of a star?

Paschen series
Brackett series
Pfund series
Lyman series
Humphreys series
Rydberg series
Balmer series

7 True or False, Lithium has an emission line in the blue.

TRUE
FALSE

8 Which of the following is not a spectral class B star?

Spica
Tau Canis Majoris
Bellatrix
Rigel
Regulus
Achernar

9 True or False, An O class star is not hot enough on the surface of its photosphere to emit X-rays.

TRUE
FALSE

10 Which of the following is not a spectral class A star?

Sirius A
Vega
Bellatrix
Deneb
Altair
Fomalhaut

11 True or False, Beryllium has an emission line in the blue.

TRUE
FALSE

12

What is the blue-radiation source [hint: planet] in the image at right?

13 True or False, Boron has an emission line in the blue.

TRUE
FALSE

14 Observations of comets have benefited greatly from what phenomenon of cyan astronomy?

Cherenkov radiation
the electric blue glow of lightning
gas-expansion velocity decreases with increasing heliocentric distance
methane possesses prominent absorption bands in the visible
adaptive optics
the light of the neutral CN-radical

15 True or False, To date, all of the reported hypervelocity stars (HVSs), which are believed to be ejected from the Galactic center, are blue.

TRUE
FALSE

16 Which of the following is not a spectral class O star?

Alpha Camelopardalis
Tau Canis Majoris
Plaskett's star
Sirius A
Pistol Star
Zeta Puppis

17 True or False, Carbon has an emission line in the blue.

TRUE
FALSE

18 Which of the following are characteristic of interstellar extinction?

redder color indices
closer stars more affected
color excess
observed color index minus intrinsic color index
red shift
blue shift

19 True or False, The red shift cannot affect blue stars.

TRUE
FALSE

20 True or False, Nitrogen has an emission line in the blue.

TRUE
FALSE

21 Which of the following are theoretical radiation astronomy phenomena associated with the Earth?

a core which emits neutrinos
a charged particle wind which emanates out the polar ionosphere holes
gravity
near the barycenter for the Earth-Moon system
the swirls of tan, green, blue, and white are most likely sediment in the water
coronal clouds
chlorophyll-containing phytoplankton aloft in the upper atmosphere

22 True or False, Oxygen has an emission line in the blue.

TRUE
FALSE

23 Which of the following are radiation astronomy phenomena associated with the gaseous-object Neptune?

Voyager 2
blue rays
clouds
neutron emission
polar coronal holes
meteor emission
rotation

24 True or False, Fluorine has an emission line in the blue.

TRUE
FALSE

25 True or False, Neon has an emission line in the blue.

TRUE
FALSE

26 Which of the following are theoretical radiation astronomy phenomena associated with a wanderer?

possible orbits
a charged particle wind
gravity
near the barycenter of its system
swirls of tan, green, blue, and white in the liquid methane
electric arcs
chlorophyll-containing phytoplankton aloft in an upper atmosphere

27 Complete the text:

Match up the blue object with the possibilities below:
Sun - H
Mercury - I
Venus - J
Earth - K
Meteorite on Mars - L
Pallas - M
Comet Holmes - N
Europa - O
Io - P
Saturn - Q
Enceladus - R
Tethys - S
Titan - T
Neptune - U
Abell 370 - V
SN 1987A - W
Crab Nebula - X

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File:Blueberrysun friedman 1296.jpg

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28 True or False, Any small luminous blue dot appearing in the cloudless portion of the night sky, especially with a fixed location relative to other such dots is most likely to be an active galactic nucleus.

TRUE
FALSE


Hypotheses

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Main resource: Hypotheses
  1. Blue astronomy of blue stars captures unique events not available at other wavelength bands.

See also

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{{Radiation astronomy resources}}

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