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.
Which layer of the atmosphere are the ionized particles that cause the aurora borealis? Aurora borealis occurs in the layer of the atmosphere called the  Thermosphere. Ionized particles from the sun are drawn to the  magnetic poles of Earth, which gives us the â¦spectacular Northern  Lights.