Why were astronomers interested in studying radio waves in the 1980s and 1990s?

a) the radio waves were coming from the sun and heading to earth.
b) the radio waves were coming from the center of the milky way.
c) the radio waves were causing static on the transatlantic telephone service.
d) the radio waves were visible and could be seen in the sky above earth.

Astronomers were interested in studying radio waves in the 1980s and 1990's because the radio waves were coming from the center of the Milky Way.

Option B

Explanation:

The telescope displayed results of the waves in the form of bubbles which are said to be light years away from the earth. Although scientists were unable to explain the phenomenon they managed to name them based on their appearance with familiar objects.

In the period of 1980s and 1990's, astronomers were interested in studying the radio waves, especially the radio waves which were arriving from the centre of the milky way galaxy. This was found by using an electronic telescope.

b

Explanation:

explanation:

i have ni idea

when studying cause and effect, historians usually group the causes into different categories. for example, cultural causes reflect how a society’s literature and art convey the way the society saw itself in relation to the rest of the world. another resource that historians use to understand society is pop culture, which tells them the trends and ideas that are preferred by the common people. when studying cause and effect, it’s important to remember multiple causation, or the idea that an effect could have several causes and vice versa.  

the correct option is “cultural causes” since art and literature are related to the culture of a place. culture is determined by literature, art, music.

the correct option is “pop culture” since it reflects the likes and ideas of common people whereas the rest of the options do not focus on common people.  

the correct option is “multiple causation” since it refers to the idea that events are caused by multiple reasons, not just a single one.