Concerning prophecies, two types of prophecies seem to indicate that a major collision with earth is possible within the next 20 years. The prophecies of Nostradamus (the French prophet who lived several hundred years ago), in Cenury 1, Number 69, describes a mile-wide mountain hitting earth, destroying entire countries. Note this is the size of asteroid 2002 NT7, due to pass near earth in 2019.

Century 1, Number 69.

"A mile-wide mountain (asteroid) strikes earth
after there is peace, war, famine, and floods,
the asteroid strike causes widespread flooding of nations,
some of which are ancient."

And in the Bible's Book of Revelation (Revelation consists of prophecies of the future, it was written about 1900 years ago by John), in chapter 8, a mountain on fire is thrown into the sea, and a blazing star strikes the earth, poisoning the water on earth, and the sun is darkened. This is actually a vivid description of what would happen to the earth-- acid rain from the dust cloud would poison the rivers and oceans, and the dust cloud would cut off sunlight. Considering that the Book of Revelation was written 1900 years ago, it is remarkable how Revelation 8 describes an asteroid hitting earth and the resulting devastation.

Revelation 8:6-13, King James version:

"8:6 And the seven angels which had the seven trumpets prepared themselves to sound.
7 The first angel sounded, and there followed hail and fire mingled with blood, and they were cast upon the earth: and the third part of trees was burnt up, and all green grass was burnt up.
8 And the second angel sounded, and as it were a great mountain burning with fire was cast into the sea: and the third part of the sea became blood;
9 And the third part of the creatures which were in the sea, and had life, died; and the third part of the ships were destroyed.
10 And the third angel sounded, and there fell a great star from heaven, burning as it were a lamp, and it fell upon the third part of the rivers, and upon the fountains of waters;
11 And the name of the star is called Wormwood: and the third part of the waters became wormwood; and many men died of the waters, because they were made bitter.
12 And the fourth angel sounded, and the third part of the sun was smitten, and the third part of the moon, and the third part of the stars; so as the third part of them was darkened, and the day shone not for a third part of it, and the night likewise.
13 And I beheld, and heard an angel flying through the midst of heaven, saying with a loud voice, Woe, woe, woe, to the inhabiters of the earth by reason of the other voices of the trumpet of the three angels, which are yet to sound!"

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