The miracle of Dunkirk: 40 facts about the famous evacuation. AS ceremonies to commemorate its 75th anniversary begin JAMES MOORE reveals 40 facts about the famous evacuation. 12:59, Thu, May 21, 2015 | UPDATED: 14:33, Thu, May 21, 2015. GETTY. 338,000 troops were rescued from the beaches of Dunkirk in Operation Dynamo.
Sunspots are magnetic regions on the Sun with magnetic field strengths thousands of times stronger than the Earth's magnetic field. Sunspots usually come in groups with two sets of spots. One set will have positive or north magnetic field while the other set will have negative or south magnetic field. The field is strongest in the darker parts of the sunspots - the umbra. The field is weaker and more horizontal in the lighter part - the penumbra. Click on image for larger version.
Can you guess what these spots could be? Sunspots is the answer! But far from having a skin problem, these dark regions have quite a different meaning. Sunspots are much cooler than the rest of the Sun and are made from what is known as magnetic activity. These areas have the strongest magnetic activity. You may have come across something that is magnetic, such objects are called magnets.