A small asteroid.....about the size of a refrigerator.....passed by us a few days ago.....undetected until it went by. Even if it had hit the earth the damage would have been minimal....but it's the 'undetected' part that has raised concern. Apparently there are some 'blind spots' out there.....kind of like in our car mirrors....where detection is difficult.
You can read for yourself the NASA description on what they are experimenting with to defend the earth from asteroids by Googling....NASA, DART....as they are about to send up....via Space X Falcon 9 rocket....an experimental vehicle that is scheduled to smash into a large asteroid next September. They point out that the large asteroid they have chosen is a "perfect testing ground"....far enough away so as not to be a problem here on earth. The scheduled impact should tell the scientists if an asteroid can be 'redirected.'
We do not know this for certain but in all likelihood the descriptions in Revelation describe asteroids hitting the earth...."Then the second angel sounded: And something like a great mountain burning with fire was thrown into the sea..." (Rev 8:8) We don't know if NASA is more concerned than they let on....for in any event they would surely make a concerted effort.....not to cause any alarm.
Many Christians had been reading Revelation intently for the last half century. God included in this book the seven letters to the seven churches to prepare us....through self-examination....along with descriptions of the beast from the sea....and the beast from the earth....but with much of the remainder of the book all we can do is keep the descriptions in mind as to the finality of God's judgment on the earth.
How more explicit could God be then the very third verse...."Blessed is he who reads and those who hear the words of this prophesy, and keep those things which are written in it; for the time is near." Revelation is for us today.....more than it ever has been in the past....and it would good for us to also take very seriously the final words....."He who testifies to these things says, 'Surely I am coming quickly.' Amen. Even so, come Lord Jesus.The grace of the Lord Jesus Christ be with you all. Amen."
Addendum: It took me at least thirty years of reading God's Word before I even began to be awed by the book of the Psalms! I had no idea God's purpose here....and cannot recommend enough that you look into this if you have not already. This week....renewingyourmind.org....is presenting a series on the Psalms by one of Ligonier's teaching fellows W. Robert Godfrey....and if you would wish to continue to research the Psalms....there is a wonderful.....and groundbreaking 2015 book out there.....The Flow Of The Psalms....Discovering Their Structure And Theology....by O. Palmer Robertson!