QUESTION IMAGE
Question
background
to view the distant and ancient universe, the hubble space telescope focused on a tiny area of black and empty night - sky. the telescope zoomed way in and took a series of long exposure pictures. from this area of black space, measuring only one thirty - millionth of the sky, a picture emerged of thousands and thousands of far off galaxies. this massive number of galaxies, each containing billions of stars, can help us start to get a feel for just how large our universe is.
the odd shape of the image is the result of the merging of multiple camera exposures into one image. three wide - field cameras were used (labeled here as a, b, and c) and a smaller planetary camera (pc).
procedure
this activity refers to \stellar objects\. this simply means a physical thing in space. in the hubble deep field, almost every visible object is an entire galaxy.
- examine the picture of the entire hubble deep field image above. make a rough estimate of how many stellar objects there are and write this number in the space below.
estimate of objects
Step1: Observe the image visually
Count the visible stellar - like dots as best as possible.
Step2: Make a rough estimate
Based on the density of the dots in the image, estimate the total number.
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(Note: Since the actual image is not provided in a way that can be accurately counted, a sample answer could be) Around 1000 (This is just a very rough estimate and can vary greatly depending on the actual image details)