United States or American Samoa ? Vote for the TOP Country of the Week !
This is on the assumption that they reflect the same proportion of the light incident upon them that their primary does. But it may very well be that they are less reflective, in which case they would be more extensive. The albedo of Mars is put by Müller at 0·27; his surface, in other words, returns 27 per cent. of the rays striking it.
The chief analyst returned, a sheet of computations in his hand. "Report, sir. The albedo measurement is correct. Looks like this may be the one." "How long before we get the measurements and comparisons?" "Ten minutes, perhaps." Rip spoke up. "Sir, there’s some data I’ll need." "What, Lieutenant?" The chief analyst pulled a notebook from his pocket.
They hadn't worked, because of loose space chatter at Marsport. O'Brine issued quick orders. "Now, get this. We have to work fast. Accelerate fifty percent, same course. I want two men on each screen. If anything of the right size shows up, decelerate until we can get mass and albedo measurements. Snap to it." The space officers started out, but O'Brine stopped them.
Then follows an elaborate estimate of the loss of heat during the passage of the sun's rays through our atmosphere from experiments made at different altitudes and from the estimated reflective power of the various parts of the earth's surface rocks and soil, ocean, forest and snow the final result being that three-fourths of the whole sun-heat is reflected back into space, forming our albedo, while only one-fourth is absorbed by the soil and goes to warm the air and determine our mean temperature.
It was to prevent Consops from knowing of the asteroid that security measures had been taken. They hadn’t worked, because of loose space chatter at Marsport. O’Brine issued quick orders. "Now, get this. We have to work fast. Accelerate fifty percent, same course. I want two men on each screen. If anything of the right size shows up, decelerate until we can get mass and albedo measurements.
THE MOON'S ALBEDO, SURFACE BRIGHTNESS, &c. Sir John Herschel maintained that "the actual illumination of the lunar surface is not much superior to that of weathered sandstone rock in full sunshine." The sun and moon being at nearly equal altitudes, and the atmosphere perfectly free from cloud or vapour, its effect is alike on both luminaries."
The chief analyst returned, a sheet of computations in his hand. "Report, sir. The albedo measurement is correct. This may be it." "How long before we get the measurements and comparisons?" "Ten minutes, perhaps." Rip spoke up. "Sir, there's some data I'll need." "What, Lieutenant?" The analyst got out a notebook.
We’re already working on it." "Anything yet?" "No, sir. We’ll have the albedo measurement in a few minutes. It will take longer to figure the mass." The asteroid’s efficiency in reflecting sunlight was its albedo. The efficiency depended on the material of which it was made. The albedo of pure metallic thorium was known. If the asteroid’s albedo matched it, that would be one piece of evidence.
At a distance of a hundred and twenty-four million miles from the sun, it must have received almost the same amount of heat that Earth does, for this sun was considerably brighter than Sol. Terra was eight thousand two hundred miles in diameter, with a fairly clear atmosphere and a varying albedo which indicated clouds in the atmosphere.
And we find, accordingly, from a combination of Zöllner's with Müller's results, that its albedo is but little inferior to that of new-fallen snow; in other words, it gives back 77 per cent. of the luminous rays impinging upon it. This extraordinary brilliancy would be intelligible were it permissible to suppose that we see nothing of the planet but a dense canopy of clouds.
Word Of The Day