This class also contains the subclass known as Protoplanetary Nebulae (PPN). This applies to astronomical objects that are experiencing a short-lived episode in a star’s evolution. This is the rapid phase that takes place between the Late Asymptotic Giant Branch (LAGB) and the following Planetar...
Despite decades of study, scientists still don't know exactly what dark matter is made of. They do know it's not made of ordinary atoms — the same kind of matter that makes up stars, planets, and people. That kind of matter is called "baryonic," and dark matter appears to be "non...
To achieve lasing, the rate of stimulated emission needs to be higher than the rate of absorption. For this to happen, the number of atoms (N), or population, in a higher energy state needs to be greater than the population in the ground state. This is known as population inversion. At...
The tungsten filament is inserted head-down into a cone called the Wehnelt cup. The filament and Wehnelt cup form the negatively charged cathode, which effectively “forces” the electrons to flow towards an anode, which is a metal disk with a hole in the center. This focuses the beam, ...
The process by which such combinations and transformations of elements into compounds take place is called achemical reaction. Atoms combine to form molecules, while atoms and/or molecules in two or more elements can join together to form a compound. ...
The resulting structure of two bonded amino acids is called a. The building blocks of proteins are amino acids. What are the covalent bonds between amino acids called? When two amino acids join together, they form a (blank). What is the name of the type of bond that forms between ...
Answer to: What is a monomer? What is a polymer? What are the differences between a monomer and a polymer? What is a dehydration reaction? By...
Atoms are the basis of the elements. There are 118 known elements in the Periodic Table, 92 of which occur naturally, and each is based on a different atom. The word "atom" comes from the Greek "atomos", meaning something that is uncuttable, or which cannot be split. Once upon a tim...
Molecules form when atoms bond with each other. They either form covalent bonds, in which the atoms join by sharing electrons with each other, or ionic bonds, in which neutrally charged atoms lose electrons, and bond with other atoms to restore balance. The noble gases are outliers because ...
It should not be thought, however, that anarchism is only a critique of modern civilisation, just “negative” or “destructive.” It is also a proposal for a free society. Emma Goldman expressed what might be called the “anarchist question” as follows:“The problem that confronts us today...