The level of DNA packaging which is brought about by the formation of nucleosomes it looks like beads on a string. In general terms, nucleosomes are termed as a basic unit of DNA packaging which is in eukaryotes. It consists of eight segments of DNA wound. Nucleosomes form a fundamental unit which repeats the eukaryotic genomes to the nucleus by ensuring a well appropriate access to it.
The answer is nucleosomes in which a part of DNA that is wrap with proteins. In the nucleus the DNA forms with proteins that is called chromatin allowing the DNA to condense into a minute volume. Under the microscope this structure looks like a bead on a string.
The reason is because it takes a long time for the light from the stars in the sky to reach earth, so the light the star was producing millions of years ago has just now reached Earth.
