题型:阅读理解 题类:常考题 难易度:普通
安徽省黄山市屯溪一中2019-2020学年高一上学期英语期中考试试卷
WELCOME AND ARRIVAL INFORMATION
Welcome to Harvard University Housing and thank you for choosing to live with us. To help you make a smooth transition, please read the information below on planning your arrival.
Pets
Dogs living with you in your pet-friendly apartment must be vaccinated for rabies and licensed with the City of Cambridge every year.
International Students
Consider unlocking your phone prior to leaving your home country. This will enable you to use a SIM card from a company such as campus SIMS or US Mobile in your phone after you arrive. Those sim cards may be available at the Property Management Office.
Driving
If you plan on bringing a moving van or truck it will not fit under the overpasses on Soldiers Field Road and Memorial Drive. Plan your route in advance to avoid a risky and costly problem.
Parking arrangements for trucks and vans must be made in advance as well. Visit your property page for information about parking your car.
Furniture and Lighting
Most HUH units have no furniture—the unit is empty except for a stove and a refrigerator. You need to bring, buy, or rent a bed, other furniture, and household items. In many HUH units, rooms do not have overhead lights, so you also may need table or floor lamps.
If you want to stock up on groceries and some household items as soon as you arrive, please find information about "Grocery Shopping" by selecting it from the drop-down menu.
To the Editors: I am surprised to read that Dr. Strojnik ("Direct Detection of Exoplanets," September-October2023) states that we have not yet and cannot directly image exoplanets (外部行星). This is incorrect. NASA/IPAC has a list at exoplanetarchive.ipac.caltech.edu/does/imaging.html. One example is an image of 51 Eridani b. The planet is 2.6 times as massive as Jupiter and has the same radius (半径). Gerard Kriss Space Telescope Science Institute |
Dr. Gerard: I am pleased that my article brought a response. The phrase "planet detection" arouses in people's imaginations beautiful images of planets that are creative artistic representations of novel worlds. But a blur of brightness is not an image. Exoplanet researchers routinely call videos such as the one below of 51 Eridani b "direct images" because the planet's light has been separated from that of its star. "Directly imaged" is the standard language of exoplanet astronomy. But to an optical (光学的) scientist such as myself, there is a strong distinction between direct detection (the planet's light separated from the light of its star) and direct imaging (a proven picture of the exoplanet). From an optical researcher's perspective, a single bright spot simply is not an image. Indeed, even the word "direct" in direct detection is debatable from an optical researcher's point of view. The detection of the light of the exoplanet requires significant processing, adding multiple images and removing starlight based on theoretical models of the source signal. But the interpretation of a bright spot as a planet is only possible upon visual inspection and optimistic thinking. As an optical scientist, I cannot look at a single spot and call it an image of exoplanets. A trajectory (轨迹), or a series of bright points, is not an image of a planet, although it very likely represents something that nowadays is described as an exoplanet. Marija Strojnik |
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