Following are the some of my collections of information based on mystery of the universe. I expect the same kind of information/questions/answers from you.

Mysteries of the universe:
1. If Heat can ONLY be transferred between objects by radiation, conduction and convection, then why a human body without space suit in a vacuum space gets cold/ frozen?
My comment: if there is no such medium in vacuum space to transfer heat and body is not emitting any radiation then how it is possible that body loses it heat without transferring it to any medium? It is mystery or something else….your comment please…..

2. Why our universe is expanding? As the distance among every massive object like satellite, planets, stars and galaxies are continuously increasing, even accelerating. The Moon is gradually moving away from the Earth and the tides are to blame. Is it really the reason, no one knows. Every year, the Moon moves a further 3.82cm from the Earth.
My comment: moon is shifting some inches from its orbit around the earth. But the question is why? Even If moon and earth both are retaining the same gravitational force continuously without any variation in it or losing it.

3. Why water boils in vacuum space before freezing?
My comment: there are many explanations given in several books that it happens due to the low or zero pressure around the water in the absence of atmospheric environment. Is it the only fact that applies on it? Or something is still unknown for our science? Your comment please….

4. Why the aircraft gets accelerated and get extra unexpected speed or extra ‘tug’ toward the sun that is not accounted for in the traditional theory? And why aircraft gets decelerated on outer-reason of our solar system?

• The Pioneer spacecraft seems to be slowing down in a way which has yet to be explained.
• Various spacecraft have experienced greater accelerations during slingshot maneuvers than expected.

5. Gravity is not, in itself, a force, but merely a consequence of universal expansion. Not only are galaxies moving apart, but stars, planets, atoms, the most fundamental particles, and the spaces between them are continuously expanding, which is what is 'pushing' the universe apart. No mass is being created in this expansion, and no changes in density of that mass are occurring.

6. Gravitational Lansing: A Mystery

7. “The conclusion of the theory of special relativity was that energy and mass are not separate things, but are, in fact, interchangeable” Sir Einstein discover the formula E=mc2, to calculate the total energy of the mass, and that seems absolutely right as per research. Now a question comes into my mind that:
‘Is there any evidence or any experiment done to come up with the practically proved logic that can explain how energy converts into mass?

8. Why a mass has gravity? There is no answer, Gravity is still a phenomena for current science, the following statement given by Newton put forwards the same question, and still unsolved:

• Newton stated in “ThePhilosophiae Naturalis Principia Mathematica,”
  “I have not yet been able to discover the cause of these properties of gravity from phenomena and I frame no hypotheses... It is enough that gravity does really exist and acts according to the laws I have explained, and that it abundantly serves to account for all the motions of celestial bodies”

9. Gravitational mass is measured by comparing the force of gravity of an unknown mass to the force of gravity of a known mass. This is typically done with some sort of balance scale. The beauty of this method is that no matter where, or on what planet you are, the masses will always balance out because the gravitational acceleration on each object will be the same.
This does break down near super massive objects such as neutron stars due to the high gradient of the gravitational field around such objects.

Accepted and proved theory: but hard to believe for a common man.

1. Gravity is not a force; it is just a wrapage of space-time. In Einstein theory of general relativity, the effects of gravitation are ascribed to space-time curvature instead of a force. Your comment please….

Exceptions to the Einstein theory:
1. How the object which is very far from massive object knows or senses that space is wrapped around the massive object and it has to go there?

Amazing/Interesting Facts:
1. Why the conversion of energy into mass is not possible? (Einstein formula E=mc2 explains the conversion of mass into energy.)

2. Some neutron stars can spin up to 1000 times a second. More earthly objects such as CD-ROMs can spin up to 100 times a second whereas music CDs spin a meager 10 times a second.

3. If 10 kilograms of matter spontaneously turned into energy there would be enough energy to power a 100 Watt light bulb for 300 million years.

4. A supernova is the most energetic single event known in the Universe:
Material is exploded into space at a speed of about 10,000 kilometers per second and the energy emitted is 10 to the power of 44 Joules. Our galaxy contains about 100,000,000,000 stars and all these stars would have to shine for six months to produce this much energy.

5. The mass of the Earth increases every year because of the 3,000 tones of meteorite debris that hits its surface from space.

Incompatibility between two popular theories:

1. Several decades after the discovery of general relativity it was realized that general relativity is fundamentally incompatible with quantum mechanics. One can demonstrate that the structure of general relativity essentially follows inevitably from the quantum mechanics of interacting theoretical spin-2 mass less particles called gravitons. It means we are still missing some unknown but very important facts of gravitational force.

Comparison between two theories:
1. Gravity is in many ways a much better quantum field theory than the Standard Model. It indirectly means, in some situation, both the theories gives different result, hence both are somewhere incompatible with each other.

Successful theory that fails somewhere….

1. MOND, the original theory on which TeVeS is based, was already quite successful at explaining galactic dynamics. (even better, in some cases, than the dark matter paradigm), but it failed completely at explaining other observations—gravitational Lansing in particular,” explained Liguori. “For this reason, it couldn't be considered a real alternative to dark matter. (not successful on all parameters of gravity)