making a model of outer space asking questions to other scientists collecting information about planets looking at the night sky with a telescope
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which of these would best help a scientist discover a new planet?
Possibilities:
- making a model of outer space
- asking questions to other scientists
- collecting information about planets
- looking at the night sky with a telescope

looking at the night sky with a telescope