Quasars and Active Galaxies
1. When quasi-stellar radio sources were first discovered and named, why were they called
They were named quasi-stellar because of their strong radio emission and star
2. How were quasars first d
1. Why did many nineteenth-century astronomers think that the spiral nebulae are part
of the Milky Way?
They thought that spiral nebulae were a part of the milky way because of their belief
that the universe was composed of one big galaxy. They b
The Sun and All Solar Characteristics and Models
How do we test models of the suns core?
The sun is a big ball of gas with three layers inside of it. The core is very hot; this is
where nuclear fusion happens. A big problem with the core is that we cant a