The  Planet  Venus  

	The  Planet  Venus.  Last  updated  November  1,  
	1995.  Constants.  MEAN  RADIUS:  6051.9  km.  MASS:  
	0.814  (Earth=1)  DENSITY:  5.24  (gm/cm)  GRAVITY:  
	0.903  (Earth=1)...  
	http://wwwflag.wr.usgs.gov/wall/venus.html    -  size  
	1K  -  1  Nov  95 

 On  Dec.  14,  1962,  Mariner's  infrared  
and  microwave  radiometers  scanned  back  and  forth  
across  the  planet,  capturing  data  that  would  
prove  Venus's  surface  to  be  fire-hot  --  about  
425  degrees  Celsius  or  800  Fahrenheit  --  warmed  
in  part  by  a  runaway  greenhouse  effect  in  the  
thick  carbon  dioxide  atmosphere.