What if we are in a secret alien community and earth is the ghetto so that’s why aliens never visit earth

Nuclear fusion is the source of energy for stars. besides hydrogen, which other element is most likely also common in stars?

Mitosis is a type of cell division that produces cells that are identical to the parent cell. meiosis is a different type of cell division that produces cells that carry have a genetic material of the parent cell. based on the information provided how do the purpose of mitosis and meiosis differ

How does the principle of electromagnetism explain the interaction between earth’s magnetic field and the solar wind?