EXTRA TERRESTRIALS? OR IS MAN ALONE BEFORE GOD EXCEPT FOR ANGELS
The context of this passage begins with God creating the heavens and the earth: the entire universe and then it focuses completely on the earth. There are no other planets which are focused upon such that one might draw any possible conclusion that they also might have life on them.
"Then God said, 'Let us make man in our image, in our likeness..."
Then we have man being uniquely made in the image of God.
The entire scenario focuses on God's creating man in His image - uniquely - and then giving man dominion over the earth. And at the end God declared that it was very good and then God rested from His creation work. No other creatures were to be created especially any in His image and no other planets to dwell upon either.
"This is the account of the heavens and the earth when they were created."
Notice that Gen 1:1-2:3 are declared as the account of the heavens and the earth when they were created. There is no mention of other planets or other life forms except those created on the earth and then God rests from His creation work and Gen 2:4 then indicates that this is the account of this work.
"Then I say a new heaven and a new earth, for the first heaven and the first earth had passed away, and there was no longer any sea."
[Compare 2 Peter 3:10-13]:
(v. 10) "But the day of the Lord will come like a thief. The heavens will disappear with a roar; the elements will be destroyed by fire and the earth and everything in it will be laid bare.
(v. 11) Since everything will be destroyed in this way, what kind of people ought you to be? You ought to love holy and godly lives
(v. 12) as you look forward to the day of God and speed its coming. That day will bring about the destruction of the heavens by fire, and the elements will melt in the heat.
(v. 13) But in keeping with His promise we are looking forward to a new heaven and a new earth, the home of righteousness."
[Notice that the heavens and earth are destroyed and a new heavens and earth created. There is no mention of extraterrestrial life]
[The Revised & Expanded ANSWERS Book, Don Batten, (editor), 2000, Creation Science Foundation, Ltd., Master Books, pp. 142-144]:
"For decades, speculation about extraterrestrial life has been boosted by tales of flying saucers and encounters with aliens. Some have even claimed that the "sons of God" and/or the nephilim of Genesis 6:4 were aliens. 
In 1996 this was fueled from another source. NASA researchers claimed to have found evidence for simple life forms in a meteorites, allegedly from Mars, found in Antarctica.
Since then, this "proof" of life in the "Mars rock" has very much lost favor among the scientific community. The supposed "nanofossils" were probably no more than magnetite whiskers  plus artifacts of the expermimental process.
The Bible, the revealed written Word of God, teaches that life is only possible through a process of creation. Even if there were other galaxies with planets very similar to earth, life could only be there if the Creator had fashioned it. If God had done that, and if these beings were going to visit us one day, then He would surely not have left us unenlightened about this.
God has given us rather specific details of the future - for example, the return of Jesus, and some details about the end of the world. The universe will, at some future point, be rolled up like a scroll (Isa 34:4; Rev 6:14). If God had created living beings elsewhere, this would automatically destroy their dwelling place as well. Adam's sin caused all of creation to be affected by the Curse, so why would a race of beings, not of Adam's (sinful) seed, have their part of creation affected by the Curse, and then be part of the restoration brought about by Christ, the last Adam? All of this would seem exceedingly strange.
[Footnote: Furthermore, Jesus dying for alien beings makes no sense, since Jesus took on human (not alien) nature, and remains the God-Man forever as our Savior. If he were to atone for Vulcans, say, He would need to become a Vulcan. The whole purpose of creation is focused on the race on earth, of which some will be Christ's "bride" throughout eternity. Christ will not have multiple "brides."]