following statement supports which theory? "Astronomers have observed protoplanetary disks around distant newborn stars." Big Bang theory Nebular theory Cell theory String theory

Answer: B

Nebula theory

Explanation:

Nebular Theory: This states that the solar system developed out of an interstellar cloud of dust and gas, called a nebula. If astronomers have observed protoplanetary disks around distant newborn stars, the Sun-to-be collected most of the mass in the nebula's center, forming a Protostar