Interstellar clouds,dust and gases are known as

________ is an application software that allows us to study about constellations in depth.

What is the default format of Geogebra ?

KTechLab includes a whole programming language called _______. 

The dark spots seen in the Sun are known as ______________.

The dark spot seen in the Sun is known as ________

Changing a file format from its default format to another is called_________.

Date and time can be set in Stellarium by using the tool ______