what is the most likely reason astronomers of the early twentieth century thought the andromeda galaxy was a…
what is the most likely reason astronomers of the early twentieth century thought the andromeda galaxy was a part of the milky way galaxy?\na the andromeda galaxy seemed to be revolving around the center of the milky way galaxy.\nb the andromeda galaxy had very few stars, and was actually only a constellation within the milky way galaxy.\nc the andromeda galaxy, which looked like a faint smudge from earth, could pass for a nebula within the milky way.\nd the andromeda galaxy is tiny compared to the milky way galaxy and would only be visible if it was within the milky way.
Answer
Answer:
C. The Andromeda galaxy, which looked like a faint smudge from Earth, could pass for a nebula within the Milky Way.
Brief Explanations:
In the early 20th - century, astronomical observation technology was limited. The Andromeda galaxy, when viewed from Earth with the available telescopes, appeared as a faint smudge. Nebulas within the Milky Way also had a somewhat similar appearance (though they are different in nature - nebulas are clouds of gas and dust, while galaxies are huge collections of stars, gas, dust, etc.). So, astronomers at that time might have misidentified it as a nebula within the Milky Way due to its visual appearance from Earth.
- Option A: There is no such indication that Andromeda was thought to revolve around the Milky Way's center to make it seem part of the Milky Way.
- Option B: The Andromeda galaxy is a large galaxy with a vast number of stars, not a constellation (a constellation is a group of stars that form a pattern as seen from Earth).
- Option D: The Andromeda galaxy is not tiny. In fact, it is similar in size to the Milky Way.