by Allison Meier on. Sharpest ever view of the Andromeda (courtesy NASA/ESA Hubble Space Telescope). The NASA/ESA Hubble Space Telescope has released the largest ever image of the Andromeda galaxy, opening up 100 million stars and star clusters to public exploration. Itâs also the sharpest view of Andromeda, the closest galaxy thatâs a spiral like our own Milky Way, ever taken.
Dizziness or light-headedness when standing up occurs as a result of abnormal blood pressure regulation. Normally, when people stand, gravity causes blood to pool in the veins of the legs and trunk. This pooling lowers the blood pressure and the amount of blood the heart pumps to the brain. Low blood flow to the brain causes the dizziness and other symptoms.
Low Blood Pressure. When you stand up quickly gravity pulls blood from your brain towards your feet and blood doesn't return to the brain until the next heart beat. With a slow pulse, this takes a second or two and that is enough time to feel the lack of oxygen in the symptom of lightheadedness or dizziness. It is also related to something called postural hypotension. This results from a decrease in blood flow to the brain, due to a drop in blood pressure upon standing up.