you call it astronomy
A black hole is an object in space. Astronomy is the study of objects in space. Therefore, black holes would be among the topics covered by astronomy.
This usually refers to the biggest lens or mirror in an optical telescope.
== == the astrolabe is to find the altitude of a stellar object
In astronomy its anything that is NOT self illuminating (i.e, is not a star).
In astronomy, the amount of light reflected by the Moon - or by any other object - is called "albedo", which literally means "whiteness".In astronomy, the amount of light reflected by the Moon - or by any other object - is called "albedo", which literally means "whiteness".In astronomy, the amount of light reflected by the Moon - or by any other object - is called "albedo", which literally means "whiteness".In astronomy, the amount of light reflected by the Moon - or by any other object - is called "albedo", which literally means "whiteness".
The biggest object in the solar system is the sun, and the smallest is Pluto
[object Object]
A BL Lac object is a term used in astronomy for a type of active galaxy with an active galactic nucleus.
It's an object in outer space; that's basically what astronomy is about - studying objects in outer space.
Air.
When a light source is only partially blocked and there is only a partial shadow on an object.