User`s guide

50 Starry Night User’s Guide
exposure observatory photograph (a much
brighter image). You also have the option
of selecting to display the outlines for
these objects instead of their images.
Milky Way Display Options
By default, Starry Night displays a
stunning photographic image of the band
of the Milky Way. If you find this image is
too bright, you can use the Brightness
slider to tone down the image brightness,
or uncheck the Milky Way box in the
Options pane, to turn off the image
entirely.
Tip (Pro and Pro Plus only): From the
Wavelength drop list, you can select from
several images of the Milky Way taken at
different wavelenghts. These include X-
Ray, Infrared, Gamma, Radio and more.
Tully Database Display Options
One of the core databases in Starry Night
contains 28 000 nearby galaxies plotted in
3-D. This database was compiled by
astronomer Brent Tully and colleagues,
hence it is referred to as the Tully
Collection. This galaxy database is very
special because it shows the 3-D position
in space of each galaxy, not just the
galaxy’s position as seen from Earth.
In Starry Night you have great control over
how this database is displayed onscreen.
To open the “Tully Database Options”
dialog box, click on the words “Tully 3D
Database” in the Deep Space layer of the
Options pane.
You will find the following options:
Bounding boxes: If you have “Entire
dataset” checked, all galaxies will be
surrounded by a 3-dimensional box, letting
you see the spacial area occupied by the
Tully Collection. “Selected filaments/
groups” will only draw a box around the
filaments/groups you have selected.
Magnification: When a galaxy is very
close, it is represented by a full-colour
image instead of a dot. This slider lets you
enlarge these galaxy images. The “correct”
position of the slider is all the way to the
left-this will draw galaxies the proper size,
and you will rarely see more than one or
two galaxy images onscreen at the same
time. Moving the slider to the right allows