European lunar probe will hit the moon

The European Space Agency's first moon probe "SMART-1", which is flying around the moon, will end its mission and plan to hit the moon on September 3.




According to a recent report by the online magazine "New Scientist", the staff of the European Space Agency Ground Control Center is preparing for this. It plans to use the remaining fuel on the detector to make the detector hit the southwestern part of the moon at a speed of 7,000 kilometers per hour. The volcanic rock plain of the "excellent lake".




Scientists predict that this detector, which is the size of a washing machine, will hit a pit of 3 to 10 meters in diameter on the surface of the moon. According to Bernard Fuwan, chief scientist of the European Space Agency's "SMART-1" project, the impact area will be black. Astronomers will use a variety of ground observation instruments to study the impact. If the debris generated by the impact rises to a height of 20 kilometers, a lucky astronomy enthusiast can even see a dust cloud rising from the surface of the moon with both eyes.




Analysis of the various observations will help scientists to further understand the history of the moon's evolution and determine whether the initial formation of the moon is caused by a star-sized planet hitting the Earth and debris being injected into space.




The "SMART-1" lunar probe was launched on September 27, 2003 and entered the lunar orbit after 14 months. The main task was to test the performance of the new detection equipment and "ion propulsion" engine, and analyze the surface material of the moon. Chemical composition to explore the origin of the moon. The detector has so far traveled more than 2,000 laps around the moon, drawing a mineral map of the lunar surface, and the camera it carries also returns a high-resolution digital picture of the moon.

Microscope Cover

The cover glass is covered on the material on the glass slide, which can avoid the contact between the liquid and the objective lens, so as not to contaminate the lens, and can make the top of the observed cells in the same plane, that is, the distance from the objective lens is the same, so that the observed Images are clearer.Why do you need a coverslip when using a microscope

1. Make the object to be observed form a thin film, which is easy to transmit light and easy to observe;
2. Make the specimen relatively fixed;
3. It is convenient to use the capillary phenomenon to form a gradient when adding various reagents (staining agent, acid, salt solution);
4. Avoid contamination of the specimen.

The purpose of staining the specimen with iodine solution is to make the cells more obvious under the microscope, and it can also kill the cells and prevent the cells from migrating.

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