Question

The best way to search for black holes is to look for small black circles in the sky.

a) This statement does not make sense. We cannot distinguish between the objects that do not emit or reflect light and their black background using direct observations. However, the presence of the objects can be deduced from the indirect observations.

b) This statement makes sense. Black holes do not emit or reflect light; therefore, they appear as noticeable black circles on the background of stars in the sky.

Answer 1

The best way to search for black holes is not by looking for small black circles in the sky. Instead, their presence is deduced from indirect observations, such as the effects they have on nearby stars.

Step-by-step explanation:

The statement 'The best way to search for black holes is to look for small black circles in the sky' does not make sense. We cannot directly observe black holes because they do not emit or reflect light, making them invisible. However, we can deduce the presence of black holes from indirect observations, such as the effects they have on nearby companion stars. For example, in binary star systems, if one star is not visible and the characteristics of the visible star indicate the presence of a massive unseen companion, it suggests the existence of a black hole.