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How do we measure the mass of a spiral galaxy?

How do we measure the mass of a spiral galaxy? Astronomers can calculate the masses of some spiral galaxies by determining their rotation speed by measuring the Doppler shift of various spectral lines versus distance from the galactic center. The mass within any given radius then follows directly from Newton's laws. How do astronomers observe the spiral structure of the Milky Way? Astronomers using data from NASA's Wide-field Infrared Survey Explorer, or WISE, are helping to trace the shape of our Milky Way galaxy's spiral arms. This illustration shows where WISE data revealed clusters of young stars shrouded in dust,...
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Which school has highest fees in Mumbai?

Which school has highest fees in Mumbai? Fee Structure of the International Schools in MumbaiSchoolYearly FeesDhirubhai Ambani International School4,48,000École Mondiale World School9,90,000Panbai International School (PBIS)1,36,000Oberoi International School5,00,000 Which is the No 1 school in Mumbai? List of Top 20 Best schools in Mumbai 2021Narsee Monjee Educational Trust's Jamnabai Narsee School.NES International School City Mumbai, State Maharashtra.Ascend International School City Mumbai, State Maharashtra.Podar International School City Mumbai, State Maharashtra.The J.B Petit High School for Girls. What is the fee of Dhirubhai Ambani School Mumbai? Fees: approx Rs 50,000 (primary and secondary school) – Rs 4 lakhs (for IB program) annually. Which...
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How do I find my BitLocker recovery key?

How do I find my BitLocker recovery key? Right-click the computer object, and then click Properties. In the ComputerName Properties dialog box, click the BitLocker Recovery tab to view the BitLocker recovery keys that are associated with the particular computer. What do I do if I lost my BitLocker recovery key? If you lost Bitlocker recovery key, there is no way to recover it. Unless you have a backup of it somewhere, for example in Active Directory (if you have setup it). Press the Windows key + X to open the Power User menu. Select “Command Prompt (Admin)“. Where is...
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What is the most depressing poem?

What is the most depressing poem? “Spring and Fall,” written by Gerard Manley Hopkins in September, 1880, and collected in his Poems and Prose, is the saddest poem ever written. What are some depressing poems? 19 Raw, Powerful, and Moving Poems About Depression“Dream Song 14” by John Berryman. “So We'll Go No More a Roving” by Lord Byron. “It was not Death, for I stood up” by Emily Dickinson. “A Question” by Robert Frost. “Sadness” by Erin Hanson. “Tarry, delight, so seldom met” by A. E. “Ode on Melancholy” by John Keats. How do you write a depressed poem? One...
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Which project is best for mechanical engineering?

Which project is best for mechanical engineering? Our list consists of the finest and most innovative major projects for mechanical engineering final year.Agricultural Robot Project.Fire Fighter Robot Project.RF Controlled Robotic Vehicle.RF Controlled Robotic Vehicle With Metal Detection Project.Obstacle Avoider Robotic Vehicle.Voice Controlled Robotic Vehicle. How are computers used in mechanical engineering? Mechanical Engineers use computers more extensively than any other physical scientists. Computers are used to help in the design process, computers control manufacturing equipment and robots, and computers are used heavily in the fields of fluid mechanics, solid mechanics and heat transfer. What projects are mechanical engineers involved in?...
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Who said Life, the Universe, and Everything?

Who said Life, the Universe, and Everything? Douglas Adams Douglas Adams said it was the answer to the meaning of life, the universe, and everything. He meant it as a joke, but a new book shows how the number 42 has played a significant role in history. What is the number of Life, the Universe, and Everything? number 42 The number 42 is especially significant to fans of science fiction novelist Douglas Adams' “The Hitchhiker's Guide to the Galaxy,” because that number is the answer given by a supercomputer to “the Ultimate Question of Life, the Universe, and Everything.” What...
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What size is the baby at 25 weeks?

What size is the baby at 25 weeks? Baby at 25 weeks is as big as a head of cauliflower, measuring 13.6 inches in length and weighing nearly 1.5 pounds. At 25 weeks, baby's size is starting to feel tangible. This baby thing is happening soon! Are babies fully developed at 24 weeks? While baby looks like a newborn already, a 24-week fetus still has a good amount of fat to gain, and their little lungs aren't fully developed yet. Baby is growing taste buds and has fingerprints and footprints already (!), but their brain is still developing and growing....
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Is the Datsun 510 rare?

Is the Datsun 510 rare? This enthusiast has owned over 230 510s. Ermish also owns an extremely rare Nissan Bluebird SSS with a 1.6 engine that is his daily driver. ... How much is a Datsun 510 worth? According to Hagerty, the values of a Datsun 510 today average at $12,400, which of course means that Concours examples can touch at least $20,000 while DIY-project ones can be your for four figures. Is Nissan bringing back Datsun? From 1958 to 1986, only vehicles exported by Nissan were identified as Datsun. By 1986, Nissan had phased out the Datsun name, but...
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How do I open a WinRAR archive file?

How do I open a WinRAR archive file? Other Ways to Open a RAR File: Right-click on the RAR file and choose "Open with WinRAR". Double-click on the file you want to open and WinRAR will launch automatically. How do I open an archive zip file? Open File Explorer and find the zipped folder. To unzip the entire folder, right-click to select Extract All, and then follow the instructions. To unzip a single file or folder, double-click the zipped folder to open it. Then, drag or copy the item from the zipped folder to a new location. How do I...
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How much time is in a soccer match?

How much time is in a soccer match? 90 minutes A soccer game is estimated to last 90 minutes and divided into two 45-minute halves. The time of the professional football matches is 90 minutes of the regular time and 5-10 minutes extra. In tournaments, extra time is played when a winner needs to be declared. Why do soccer games go over 90 minutes? The reason you will see games go over 45 or 90 minutes in soccer is because of stoppage time. Stoppage time is extra time added onto the end of each half to make up for time...