[Answer] 7. Brown dwarfs are very faint and are therefore difficult to find in the night sky. Which of the options below is a method utilized to find them?

Step 1 : Introduction to the question "7. Brown dwarfs are very faint and are therefore difficult to find in the night sky. Which of the options below is a method utilized to find them?"

...1. Imaging sections of sky and searching for faint, red sources 2. All of these 3. Focusing on known stars and looking for companions 4. Concentrating on young star clusters All of these are techniques used to find brown dwarfs.The majority of stars have companions and stars that appear single may have faint brown dwarf partners. Gliese 229B was found this way, it was a companion to the red dwarf star GI 229A. Brown dwarfs emit mainly in the infrared and scanning for faint red sources would help find field brown dwarfs like Kelu-1. PPI 15 was found in the young star cluster, the Pleiades. Brown dwarfs are brightest and easiest to find when they are young.

Step 2 : Answer to the question "7. Brown dwarfs are very faint and are therefore difficult to find in the night sky. Which of the options below is a method utilized to find them?"

All of these:

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