When the aliens finally invade Earth, you may wish you had listened to Travis Taylor and Bob Boan.And if the invasion follows the plot of a typical Hollywood blockbuster, they might also be the guys called in at the last minute to save the day.After all, they have written "An Introduction to Planetary Defence", a primer on how humanity can defend itself if little green men wielding death rays show up at our cosmic doorstep.And yes, they're serious."The probability really is there that aliens exist and are old enough to have technology to enable them to come here," Taylor said in an interview.Taylor and Boan are hardly basement-dwelling paranoids obsessed with tinfoil hats and Area 51. Taylor holds advanced degrees in astronomy and physics, and is an associate at consulting firm Booz Allen Hamilton. He and Boan have done consulting work for the Defence Department and the U.S. space agency NASA.But their views have won few audiences outside of science fiction conventions, and their book is published by BrownWalker Press, which specialises in fringe topics and books with titles like "The Science and Lore of the Plant Cell Wall" and "ESP and Psychokinesis"
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Not to worry, ghost. If they had any reason to invade Earth, they would have done so already. The advanced mental powers of levitation and apports over light-years requires advanced spiritual development. Remember the Prime Directive for Star Trek? Word. BTW, in today's news I see that an Earth-like planet circles Gliese 581, a mere 20 light-years away. Gliese 581 is a red dwarf, M class, not visible with the naked eye. The Earth-like planet enjoys a balmy 68 degree Fahrenheit climate, and its "year" is only 13 days, so it is quite close to the star. This is encouraging news, since about 80% of the stars within 22 light-years radius are red dwarfs. There are no other G2 yellow dwarf singlets within that radius, though recently it has been shown that multi-sun systems could have stable planetary orbits. Star A of Alpha Centauri is a G2 yellow dwarf, about 1.5 times the mass of our sun, with star B about 40 AU away. That would be beyond Neptune.
Do you think we really are a threat to the rest of the universe? We might be if we could get there, but so far we have gotten no further than our moon, a 4 day trip each way. We could send astronauts to Mars, but after a 3 year trip, they would be dead from that much weightlessness as well as dead from cosmic rays. I'm not talking about the Solar Wind. I'm talking about the nuclei of heavy elements accelerated close to C that come from outside the Solar System. We are only protected from that here on Earth by the 10 miles of air over our heads. There has been no progress in space travel technology since the summer of 1969.
Technology is irrelevant. The star-traveling humanoids who visit us (see 
~~~Cebrakon
You have nothing to fear from UFOs. They are mostly found in remote locations, lightly populated, and they silently glide along close to the ground, below the radar. Most or all contacts have been accidents. For instance, one of the cases presented in detail in The Humanoids tells of an encounter by Professor Johannis (in 1947, just a few weeks after Roswell). This happened in the mountainous province of Friuli, the most NE piece of Italy. Like many Europeans, the Professor was fond of hikes in the mountains. Einstein and his friends liked to do that, BTW. Using his climbing stick, which had an ice pick as the handle, he climbed to a high and deserted valley, where he found a bright red disk stuck in the mountain side. Flying saucers had not yet made the European press, and the Professor was thunderstruck. He saw some boys a little ways off and he ran over to them, shouting incoherently and waving his walking stick. As he came close, he realized to his horror that they weren't boys. They were not of this Earth! They had an earthy green complexion, with lemon green, bulging eyes. They were the size of boys, not very tall. They wore bright blue coveralls, with red cuffs. As Professor Johannis came up to them, spluttering in consternation, they released a gas which partially paralyzed him. They then took his stick. He was able to turn over to see the red disk, which emerged from the cleft in the rocks, undamaged, with an explosion of rocks and boulders. It hovered silently for a moment and then rapidly disappeared into the distance.
In many ways, this is a typical case. Although he was given a good fright, Professor Johannis was not harmed. There are many instances of people temporarily paralyzed if they appear dangerous, but nothing worse. 
One of the things that puzzled the early Ufologists is, "Why don't they make official contact? Why don't they land on the White House Lawn?" If you know anything about anthropology, you will know that such full contact between advanced cultures and primitive cultures often causes the disappearance of the primitive culture. With all their creation myths destroyed, they have not the heart to continue living. Let us suppose the star-traveling humanoids ARE anthropologists. After all, they carry no weapons, and have never attacked a human or an airplane or anything else. Thus, it would be part of their morality to leave the primitive culture alone, while studying it unobtrusively. They are also interested in our flora and fauna and the geology.