A great deal of the research was concentrated on X-ray coming from astronomical objects.
The lower rim of an astronomical object is always red.
It is not hard to view spectra of astronomical objects.
Some are non-planet astronomical objects like the moon or the sun.
Many types of astronomical objects are not included with Celestia.
Previously, the smallest astronomical objects of which an image had been made were about 6.2 miles across.
A magnetosphere is the region around an astronomical object, like a planet.
It used a single mirror to reflect the image of an astronomical object to the observer's eye.
However, it is difficult to determine the distance to astronomical objects.
Not that we expect anything more than interesting astronomical objects.
Wörterbuch für Astronomie