An angiogram uses X-rays and a special dye (contrast) to take pictures of the arteries in your brain, heart, and kidneys. The dye is injected into a small tube or catheter into an artery in your groin or (sometimes) your arm.
As the cloud collapses the force of gravity drawing the cloud inward gradually becomes stronger because the strength of gravity follows an inverse square law with distance. hoâ¦pe that helps.
The nature of this collapse is uncertain, and two theories for how a molecular cloud collapses dominate the scientific investigations. Molecular clouds are susceptible to gravitationally collapse, because gas pressure alone cannot counteract the gravitational force a cloud exerts on itself.