Felt bad when I saw this. I dont know why this happened, but I am sure we will make it next time

I was thinking what is this Cryogenic technology, that makes it so complex for us ?

A cryogenic rocket engine is a rocket engine that uses a cryogenic fuel and/or oxidizer, that is, its fuel and/or oxidizer are gasses liquified at cryogenic temperatures.

The use of liquid fuel rocket engines was first considered by the German, American and Soviet engineers independently, and all discovered that rocket engines need high mass flow rate for both liquid oxidizer and fuel, for generating the necessary thrust. Higher thrust levels were achieved when liquid oxygen (LOX) and liquid hydrocarbon were used as fuel. At room temperature and pressure, oxygen and low molecular weight hydrocarbons are in gaseous state. To get the required mass flow rate, the only option is to feed them to the engine in liquid form. Therefore, they are converted to liquid form by cooling them down, and are stored in the rocket’s fuel tanks at very low temperatures. Hence engines that use these fuels are called cryogenic rocket engines.

Various cryogenic fuel-oxidizer combinations have been tried, but the liquid oxygen (LOX) oxidizer and liquid hydrogen (LH2) fuel combination is one of the most widely used. Both components are easily and cheaply available, bio-friendly, non-corrosive and when burned have the highest entropy release by combustion, among all non-toxic pairs. Liquefaction temperature of oxygen is 89 kelvins and at this temperature LOX achieves a density of 1,140 kg/m3 (1.14 g/cm3). And, for hydrogen it is 20 kelvins, a few kelvins above absolute zero, and gains a density of 70 kg/m3 (70 mg/cm3). All cryogenic rocket engines work on expander cycle or gas-generator cycle or staged combustion cycle depending on thrust requirement, since the oxidizer and fuel are at sub-zero temperatures. LOX LH2 cryogenic rocket engines produce specific impulse up to 450 s (4.4 kN·s/kg).

String theory is a developing branch of theoretical physics that combines quantum mechanics and general relativity into a quantum theory of gravity. The strings of string theory are one-dimensional oscillating lines, but they are no longer considered fundamental to the theory, which can be formulated in terms of points or surfaces too.

String theory itself comes in many different formulations, each one with a different mathematical structure, and each best describing different physical circumstances. But the principles shared by these approaches, their mutual logical consistency, and the fact that some of them easily include the standard model of particle physics, has led many physicists to believe that the theory is the correct fundamental description of nature. In particular, string theory is the first candidate for the theory of everything, a way to describe all the known natural forces (gravitational, electromagnetic, weak and strong interactions) and matter (quarks and leptons) in a mathematically complete system.

Many detractors criticise string theory because it has not yet provided quantitative experimental predictions. Like any other quantum theory of gravity, it is widely believed that testing the theory directly by experiment would require prohibitively expensive feats of engineering. Whether there are stringent indirect tests of the theory is not yet known.

String theory is of interest to many physicists because it requires new mathematical and physical ideas to mesh together its very different mathematical formulations. One of the most inclusive of these is the 11-dimensional M-theory, and in the M-theory way of thinking, string theory requires spacetime to have eleven dimensions,^[1] as opposed to the usual three space and one time. The original string theories from the 1980s describe special cases of M-theory where the eleventh dimension is a very small circle or a line, and if these formulations are considered as fundamental, then string theory requires ten dimensions. But the theory also describes universes like ours, with four observable spacetime dimensions, as well as universes with up to 10 flat space dimensions, and also cases where the position in some of the dimensions is not described by a real number, but by completely different type of mathematical quantity. So the notion of space-time dimension is not a fixed thing in string theory: it is best thought of as different in different circumstances.

String theories include objects more general than strings, called branes. The word brane, derived from “membrane”, refers to a variety of interrelated objects, such as D-branes, black p-branes and Neveu-Schwarz 5-branes. These are extended objects that are charged sources for differential form generalizations of the vector potential electromagnetic field. These objects are related to one-another by a variety of dualities. Black hole-like black p-branes are identified with D-branes, which are endpoints for strings, and this identification is called Gauge-gravity duality. Research on this equivalence has led to new insights on quantum chromodynamics, the fundamental theory of the strong nuclear forces