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.
Auroa borealis is caused by gaseous particles in the atmosphere of  the Earth colliding with charged particles that are released from  the atmosphere of the sun. The result â¦of the collision is the  bright dancing lights that appear in the sky.