30 Why do scientists suspect that most of our galaxy’s mass consists of dark matter?.29 How do astronomers estimate the distance between galaxies?.28 How do astronomers measure extreme cosmological distances?.27 What method do astronomers use in determining the distances to celestial objects?.26 How do we measure the distances to stars and galaxies quizlet?.25 How did scientists learn about Earth’s place in the solar system?.24 How do scientists take pictures of the Milky Way?.23 Why did they scientists originally believe that the Sun was near the Milky Way’s center?.22 Why did scientists conclude that a black hole is at the center of the Milky Way?.21 How did we measure the distance to the sun?.20 How do we determine the distances to a nearby star quizlet?.19 How did astronomers determine the mass of the supermassive black hole in the center of our Milky Way galaxy to be about 4 million solar masses?.18 How does NASA measure distance in space?.17 How did astronomers measure the distance to globular clusters historically )?.16 How can astronomers be sure that their measurements of distances to galaxies are accurate quizlet?.15 How do scientists know so much about other planets?.14 How do scientist know how far planets are?.13 What do scientists believe is at the center of the Milky Way galaxy?.12 How do scientists measure the distance between planets?.11 Why do scientists use light minutes and light hours instead of light years to measure distances within our solar system?.10 What is the most accurate way to determine the distance to a nearby star?.9 How did astronomers first determine the distance to the galactic center?.8 How do scientists detect more distant planets outside of our solar system?.7 How does radar measure distance in space?.6 Why do scientists measure distance in light-years?.5 How did scientists first measure the distance in space?.4 What units do scientists use to measure distances in space?.3 How do we measure distances in space?.2 How do scientists measure things in space?.1 How the scientist calculate the distances of the galaxies?.To keep itself informed of and study critically the status of physics.To assist industries, national and other agencies in their developmental tasks by precision measurements, calibration, development of devices, processes, and other allied problems related to physics.To identify and conduct after due consideration, research in areas of physics which are most appropriate to the needs of the nation and for the advancement of the field.To establish, maintain and improve continuously by research, for the benefit of the nation,.To strengthen and advance physics-based research and development for the overall development of science and technology in the country.The weights and balances used in local markets and other areas are expected to be certified by the Department of Weights and Measures of the local government.It is the responsibility of the NPL to calibrate the measurement standards in these laboratories at different levels.Responsibility of National Physical Laboratory (NPL): Physical quantities can only be added if they have the same Units Currently Accepted for Use with the SI System: NameĬalculation of number of kilometers in 20 miles:Ĭonversion factors a mile = 5280 ft, 1 ft = 12 in, 1 in = 2.54 cm, 1 m = 100 cm, 1 km = 1000 m.Ģ0 miles = 20 × 5280 ft = 20 × 5280 × 12 inches
Units outside SI but Frequently Used in Physics: Name shake is used to measure very small time.Extremely small areas are measured in barn.Mass is measured in slug, metric ton, quintal.1 chandrashekhar unit = 1.4 times mass of the Sun. Chandra Shekhar unit is practical unit of measuring large masses.One a.m.u.: It is defined as 1/12 th of the mass of one atom. 1 a.m.u.A light-year (ly), parsec (pc) are used to measure the distance between stars and the astronomical unit is used to measure the distance between planets. Note that light-year (ly) and parsec (pc) are units of distances and not of time.
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