The primary difference between a nova and a supernova is the strength of the explosion. Novas and supernovas are similar in that they both produce a large release of energy through the exchange of gases between two stars. The stars involved include a normal star and a white dwarf, which is a star that is dying.Know More
A nova occurs when the normal star and the white dwarf orbit each other closely enough for the white dwarf to draw hydrogen gas off the star to create a release of energy. The gas is compressed on the surface of the white dwarf through strong gravitational forces and fuses into helium, which causes the explosion. Visually, the white dwarf becomes suddenly brighter and slowly fades away.
The type of supernova that is similar to a nova goes through the same process, but under the right circumstances, the hydrogen gas compresses more densely. When it fuses on the surface of the white dwarf to become helium, it creates a much larger explosion. The explosion can be so violent that the white dwarf may be completely destroyed.
The second type of supernova happens between a white dwarf and a much larger star. The type of star that creates a supernova has a mass that is eight times larger than the sun. The white dwarf draws the hydrogen gas into its core to create helium, but when the hydrogen runs out, the helium fuses into carbon. From there, a number of fusions occur until the core is primarily made of iron. As the pressure builds further, the iron begins to fuse, extracting the heat and the electrons from the core. This causes the core to collapse and the outer layers of the star to explode, creating a supernova.Learn More
The primary difference between gross domestic product, or GDP, and the gross national product, or GNP, is that the GNP also takes into account income from foreign sources while the GDP does not. Both the GDP and GNP are measurements that are used to determine the economic output of nations during a period of time, and are usually measured on an annual basis.Full Answer >
The two birds are difficult to tell apart, but the primary difference between a raven and crow is that the raven is larger and heavier. The raven also has a thicker bill and a wedge-shaped tail, while a crow's tail is rounded and straight.Full Answer >
The primary difference between deontology and utilitarianism, two competing systems of ethics, is that the former system is concerned with whether an act is intrinsically right or wrong, while the latter system believes that only the consequences of an act are important. Deontology deals with intentions and motives. Utilitarianism focuses only on results.Full Answer >
The primary difference between sand and silt is the particle size. Sand is composed of large particles, making it excessively coarse. Silt is made of much smaller particles and is slippery to the touch.Full Answer >