The thing that makes kes73 interesting to astronomers is ; ( A ) A second star.
kes73 is believed by astronomers to have come from the explosion of dying stars in the supernova. The gases from the dying stars explode and scatter across forming a colorful cloud known as kes73.
At the center of the colorful cloud formed from the gases of the dying stars is a second star ( magnetar ) which is the most powerful star in the galaxy due to its magnetic force.
Hence we can conclude that the thing that makes kes73 interesting to astronomers is the presence of a second star
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The definition of vestigial organs are rudimentary structures in humans
that correspond to a functional structure or organ in an ancestor.
Basically the answer is redundant organs present in an organism, which
have been functional in the organism's ancestors.
The 10 amino acids that we can produce are alanine, asparagine, aspartic acid, cysteine, glutamic acid, glutamine, glycine, proline, serine and tyrosine.
You can prove they're related by their DNA