Astronomy by William T. Skilling; Robert S. Richardson PDF

By William T. Skilling; Robert S. Richardson

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Body, and weight attraction upon is Mass is the quantity of material a measure of the force of the earth's this material. A pound mass would weigh a PKOPOSCD By KCHNCL L MO H€»vlilDC WITH DCfUCTINO aecioN V TMC ajrcR ATMO^PKK DAOlO ¥Hv£S CAN BC DCCeiVCO AROUHC wiTHOjt DC rLeer INC pccion »Aoic tvAves M/omo thavcl OUT-AABO IHTO SPACE AND WOULO NOr CUftvE ABOUND 'HC CARTM CUDVtO SURFACe Of rne CARTH PATH OF HIGH FREQUENCY (MOST PENETRATING) -500 PATHS OF INTERMEDIATE FREQUENCIES path of low frequency (least penetrating) -TRANSMITTER Fig.

THE ATMOSPHERE Methods of exploring the upper atmosphere. Many ingenious methods have been devised for exploring the upper atmosphere. 7 miles. Unmanned balloons carrying lightweight instruments have gone to 19 miles. Radio transmitters attached to the instruments signal readings directly to the ground, thus avoiding the uncertainty of locating the balloon after Valuable information trails (70 to 100 miles); may it falls to earth. from meteor which (about 50 miles); and also be obtained from the duration of twilight, due to sunlight reflected from the air from the altitudes attained by various forms of the aurora is borealis (about 50 to 600 miles) (Fig.

But for this we would not see it at all, for, like the hundred or so of its kind, it is exceedingly far away. interesting chiefly for Double stars, of which there are many ally too close together or too dim to its in the sky. are usu- be seen well with any IHi: 1)lU threat telescopes. of these fairly I'LKl'OSi: OF ASIROSOSW But a few are well worth 17 lindint^. One the middle star of the Dipper handle, Mizar. '' separated, 35" apart, and have is The component marked contrast stars are well in color; one orant^e, the other blue.

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Astronomy by William T. Skilling; Robert S. Richardson

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