Answer to Question 1
Meteorites are fragments of parent bodies that were large enough to grow hot from radioactive decay or other processes. They then melted and differentiated to form iron-nickel cores, and rocky mantles and crusts. The molten iron cores were well insulated by thick, rocky mantles resulting in very slow cooling of the iron core and producing Widmansttten patterns. Collisions could break up such differentiated bodies and produce different kids of meteorites.
Answer to Question 2
Yes. Faint comets are common; several dozen are discovered each year. Truly bright comets appear about once per decade. An average person might see five or ten bright comets in a lifetime. Astronomers do not know exactly how many, but there could be one hundred billion in the Oort cloud.
Three types of aneurysms.
Types of Insulin: Actions and Administration
Under ideal conditions, a single cell of the bacterium E. coli would divide every 20 minutes to ...
Segregation of chromosomes at meiosis in a 14/21 translocation carrier. Six types of gametes are pro
Annotation of a DNA sequence containing part of the human beta-globin gene
Events of an Ovarian/Mentrual Cycle Lasting Twenty-Eight Days