And, last for now, close encounters of the NEO kind.... something to think about, these are PAST encounters.

RECENT CLOSE APPROACHES TO EARTH 1 AU = ~150 million kilometers
1 LD = Lunar Distance = ~384,000 kilometers
Object
Name 		Close
Approach
Date 		Miss
Distance
(AU) 		Miss
Distance
(LD) 		Estimated
Diameter* 		H
(mag) 		Relative
Velocity
(km/s)
(2010 NH) 2010-Jun-30 0.0067 2.6 21 m - 48 m 25.5 10.24
(2010 LZ63) 2010-Jun-30 0.1332 51.8 260 m - 580 m 20.0 27.61
(2010 LN14) 2010-Jul-01 0.1556 60.6 160 m - 350 m 21.1 10.18
(2005 WE) 2010-Jul-02 0.1321 51.4 320 m - 720 m 19.6 9.29
(2009 HU44) 2010-Jul-02 0.1479 57.6 84 m - 190 m 22.5 21.46
(2010 MY1) 2010-Jul-03 0.0203 7.9 44 m - 99 m 23.9 6.87
(2010 NN) 2010-Jul-03 0.0035 1.4 5.7 m - 13 m 28.4 7.83
(2010 KU7) 2010-Jul-05 0.1524 59.3 95 m - 210 m 22.2 8.18
(2010 MJ1) 2010-Jul-05 0.0986 38.4 52 m - 120 m 23.6 9.50
(2010 NA) 2010-Jul-05 0.1068 41.5 210 m - 470 m 20.5 20.13