NASA is closely monitoring the arrival of a previously unseen asteroid that is set to brush past Earth tomorrow at 21,362 miles per hour.   The space rock had been invisible to astronomers until Christmas Day when it was first identified.  Now called asteroid 2017 YZ4, it will come past us between the Earth and the Moon at a distance of just 139,433 miles. The Moon is 238,000 miles from Earth, and this pass

is considered a cat’s whisker in astronomical terms. NASA considers and monitors anything which comes within six million miles of our planet as a near-earth asteroid. The small asteroid is estimated to be between 7 and 15 meters (22.6 to 49 feet) in diameter. Although relatively small, if it did impact Earth, it could cause injuries.  READ MORE