* Astronomy

The 37 - 82 metre wide asteroid 2004 ER21 will make a close pass (31.8-lunar distances, 0.0816-AU), travelling at 7.21-km/second, to the Earth-Moon system on the 6th April, 2010.

See more

The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).