Concept explainers
Whether the statement is true or false.
Answer to Problem 1QAP
The given statement is false.
Explanation of Solution
Light travels at a speed of
Such large distances are measured in units of light years denoted by
Here, the distance given is
Conclusion:
Thus, one mega-light-year is not equal to 1,000 light years. Hence, the given statement is false.
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Chapter 1 Solutions
Understanding Our Universe
- The mass of the Earth is about 6 x 1021 metric tons, and the mass of the Sun is about 2 x 1027 metric tons. About how many times more is the mass of the sun compared to the mass of the Earth? Put the numbers into Scientific Notation. Do your calculations using the product or quotient rule. Then write your answer as a Standard Number. What is the proper name of the answer?arrow_forwardAccording to our best astronomy, the observable universe is about 91 billion light years in diameter. What is the diameter of the observable universe in gigametres?arrow_forwardHow long would it take a space craft that was traveling at a speed of 61,079 km/hr to travel a distance of 116 lightyears?arrow_forward
- A volume in space is exactly 1.00 pc3. Conversion from parsec to meters is 1 pc= 3.086 x 1016 m. How many cubic meters are contained in one cubic parsec?arrow_forwardAn isotope of a radioactive element has half-life equal to 9 thousand years. Imagine a sample that is so old that most of its radioactive atoms have decayed, leaving just 25 percent of the initial quantity of the isotope remaining. How old is the sample? Give your answer in thousands of years, correct to one decimal place.arrow_forwardMap scales may be presented as a ratio, or as a bar on which distances are measured. A ratio of 1:50,000 means that every inch on the map represents 50,000 inches on the ground. If a has a scale where 1 inch represents 1 mile, what would be the scale expressed as a map ratio? (Hint: you need to calculate how many inches are in a mile) 1: On the bar below, how many miles are represented by 1 inch? miles What is this scale expressed as a ratio? 1: What is the value of point 'X'? 10 X 20 Scale (miles)arrow_forward
- The Earth is about 12,000 km in diameter. It is therefore how many orders of magnitude wider than you are tall? (i.e., the Earth’s diameter is how many times larger than your height (give an order-of-magnitude estimate)?)arrow_forwardIf the speed of light is given as 299,792,458 meters per second and the wavelength is 375 nm. what is the frequency of this light? Give your answer in THzarrow_forwardAstronomers frequently say that “there are more stars in the universe than there are grains of sand on all the beaches on the earth”. Given that a typical grain of sand is about 0.5 – 1.0 mm in diameter, estimate the number of grains of sand on all the earth’s beaches. The diameter of the Earth is 12,742 km.arrow_forward
- (a) Astronomers use a special unit to measure distances called astronomical unit (AU) where 1 AU is defined as 92,955,807 miles. They also use another unit called parsecs where 1 parsec is equal to 206,264.4 AU. Convert 1 Zm (zettametre) into kiloparsecs. (Given 1 mi = 1.609 km; 1 km = 1000 m).arrow_forwardStars are spherical in shape. A star has a diameter of 77 x 1010 m. How many earths could fit inside this star. Diameter of earth 12800 km Note: Write the answer in scientific representation after rounding to two decimal places. Answer:arrow_forwardDuring a total solar eclipse the Moon’s shadow travels across the Earth at a speed of about 2400 km/hr or 667 m/s. If Texas is 1,244 km (1,244,000 m) wide, how long will it take (in minutes), for the shadow to travel across Texas?arrow_forward
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