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Gravity in Newton physics is due to the presence of mass,just like the charge is the cause of electrical field ,and then electric force,so ,the presence of mass causes a gravitational field,which has a force,it affects any other mass within its domain,its moderator is a postulated boson, encoded as graviton,not detected yet.This is a classical concept to gravity , it is a limit ,or an approximation ,to the gravity defined by the general relativity(as spacetime curvature),when the energy-momentum tensor in Einstein equation approches the mass density.

This is a neat question... you'd think with all that mass in such a small space the Universe would form a black hole...Let's see if we can get a quantitative grip on this question. First off recall that the Schwarzschild radius of a BH is:[math]R_s=\frac{2GM}{c^2}[/math]And the mass of a ball can be written in terms of the average density as:[math]M=\frac{4}{3}\pi R_s^3\rho .[/math]Plugging the mass equation into the radius equation, and solving for the density, we get:[math]\rho = \frac{3c^2}{8\pi G} \frac{1}{R_s^2}[/math]This is already interesting because it tells us that as BHs get bigger, their average density decreases. Next let's recall the Friedmann equation for the Hubble parameter (the rate at which space is stretching):[math]H^2 = \frac{8\pi G}{3}\rho[/math]Now things are getting interesting... plugging in the density of a BH we find:[math]R_s = \frac{c}{H} [/math]We need one final ingredient: how big is the Universe during this early time? The Hubble parameter tells us the rate of expansion, and at the observable edge of the Universe (the Hubble Bubble) the expansion would be luminal, so we can write the speed of light in terms of the radius of the Universe:[math]R_s = \frac{H R_U}{H}=R_U[/math]Wow! The radius of the Universe is the Schwarzschild radius of the Universe!You were absolutely correct. The Universe does form a black hole at the "Big Bang". Or perhaps a better way to say it isThe Universe IS a black hole, and we're all inside of it.Cool, huh?Disclaimer:This is just a cute coincidence , don't take it seriously. Note, however, the use of mathematics in making the argument. If you're going to be arguing anything relevant in cosmology and physics, then make sure you know the math behind it. Real physicists will be able to point out why this argument fails. The key point here is this: learn math because it, and not English, is the language in which we discuss things in physics.

Jupiter has a volume of 1.43 × 10[math]^{24}[/math] m³. Earth has a volume of 1.08 × 10[math]^{21}[/math] m³.[math]\dfrac{1.43 × 10^{24} m³}{1.08 × 10^{21} m³} = 1 \,322 \text{ Earths} \tag*{}[/math]But this is assuming Jupiter is completely filled with Earth volumes. If we stack complete Earths, the most optimal configuration is with sphere packing, which will fill 74% of the volume. So that’s 978 Earths.In terms of mass, Earth fits into Jupiter almost 318 times.And just for fun, let’s see how many of all the planets in the Solar System fit into Jupiter:Saturn — 1.73, or 1 whole SaturnUranus — 20.94, or 15 with sphere packingNeptune — 22.89, or 16 with sphere packingEarth — 1,322, or 978 with sphere packingVenus — 1,542, or 1,141 with sphere packingMars — 8,775, or 6,493 with sphere packingMercury — 23,530, or 17,412 with sphere packing

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Then you Are in luck, you Will see rapid progress in fat loss while maintaining most of your muscle if you follow these guidelines-Eat sufficient protein. Aim for atleast 1g pr. Pound of -Lean tissue mass- this is excluding your enormous fat resource.Stay in a deficit of calories. The deficit should on average over a week or longer, not drop below 20% of your need (including activity) But!!You Can get away with signNow drops in calories for a few months at a time, if your bodyfat is over 25-30%! This is because your body can easily supply energy reserves directly from your fat. This also protects muscle wasting. This buffer quickly loses effectiveness as you start dropping below 25%, and especially 20% or less - you Will start burning muscle and you Will feel like shit, so refeed shortly and make the deficit less pronounced onwards3. Train fairly low volume in terms of sets and reps, and do mostly big compounds, but keep the intensity challenging for your muscles. The more you try to focus your workout on preserving your overall strength, the less willing your body is to make an adaptation that Will strip you of strength, like wasting muscle tissue.4. Maintain your volume in terms of reps and sets and weight, but be mindful of slowed recovery. When you start struggling to keep your numbers up, accept that its time to minimize the calorie deficit and do not overdo on frequency of training. Stretch frequency just long enough to keep strong enough to do your work.5. Accept loses in strength and muscle as you climb down under 20% fat, and accept that these loses Are going to intensifies the leaner you get.6. Stop underfeeding when you signNow your goal. Also start to eat even more protein if you climb under 15% fat.7. Feeling sick, lethargic and moody? Body composition suddenly started to burn a lot of muscle and less fat? Get your eating and recovery in check, and be mindful to minimize volume of training, as All of this compounds stress that disrupts hormone homestasis in the body. You mess up your hormones, you won't get favourable results. The Best patch up solution is to refeed over maintainance for a periode of time until you regain your senses and your energy. Then try cutting again, but less aggresively. Optimize recovery.