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The two moons of Mars are Phobos and Deimos. They are irregular in shape. Both were discovered by American astronomer Asaph Hall in August 1877 and are named after the Greek mythological twin characters Phobos (fear) and Deimos (panic) who accompanied their father Ares into battle. Ares god of war was known to the Romans as Mars.. Compared to the Earth’s Moon the moons Phobos and …
Supernova searches fall into two classes: those focused on relatively nearby events and those looking farther away. Because of the expansion of the universe the distance to a remote object with a known emission spectrum can be estimated by measuring its Doppler shift (or redshift); on average more-distant objects recede with greater velocity than those nearby and so have a higher redshift.
Stellar evolution is the process by which a star changes over the course of time. Depending on the mass of the star its lifetime can range from a few million years for the most massive to trillions of years for the least massive which is considerably longer than the age of the universe.The table shows the lifetimes of stars as a function of their masses .
Cavitation is a phenomenon in which rapid changes of pressure in a liquid lead to the formation of small vapor-filled cavities in places where the pressure is relatively low.. When subjected to higher pressure these cavities called “bubbles” or “voids” collapse and can generate a shock wave that is strong very close to the bubble but rapidly weakens as it propagates away from the bubble.
In physics energy is the quantitative property that must be transferred to an object in order to perform work on or to heat the object . Energy is a conserved quantity; the law of conservation of energy states that energy can be converted in form but not created or destroyed. The SI unit of energy is the …