Is it true that viruses or virus-like crystals may reach the earth surfaces comming from the outer space?
89359
i'm going to say no. dna has evolved in organisms over millions of millions of years on this planet to be just the way it is today. viruses are random strands of this dna or rna (viruses are not alive). the chances that a similar genetic material has developed elsewhere in this universe is extremely thin, and on top of that, there would be a slim chance of it somehow reaching our earth.
351366
The earth is continuously bombarded by small cosmic dust particles, ranging in sizes. The bigger onces millimeter size and bigger burn up in the atmosphere of the earth leaving visible traces that may last seconds or longer.
1137891
there was a unmanned moon mission a couple of years before the manned, I'm not sure of the timespan. I think someone else can build on it.but anyway the astronauts went to this vehicle and pulled the camera lens, took it back, swabbed it and found that some one contaminated the interior with a sneeze or something. They fed it and sure enouph bacteria sprang up ready to rock. Gives you the spooks don't it
238901
Yes it is true.Just watched a program on national geographic about the unknown deep blue of our oceans and seas.Space has had so many explorations now that we are closer to the outer limits of our solar system than ever before.
26676
Objects of any size can enter the Earth's atmosphere. We don't exactly have a security guard keeping out the big ones.
212107
There are places in outer space who are more dangerous than your asked question....\n\nWho are You to ask what God has to do or not\nwe all are just dust in the Universe....
139768
By the time that happens the Earth will have already been destroyed by the sun. But if the Earth was still around, it is highly unlikely that we would collide with any matter at all, since space is mostly just dust and emptiness, believe it or not. We would likely have a higher-than-usual amount of dust moving about the solar system, however.
748593
There is no evidence that alien species from other worlds or other galaxies have ever visited Earth. The examples given have all been debunked by numerous scientists. We'd like to believe there is life out there, but we haven't heard from anyone yet. Because the distances are vast -- measured in hundreds of thousands of light years -- it is more likely that we would have radio or television transmission, which travels at the speed of light, than a visit in person. Maybe they're listening to our TV broadcasts and don't think we're intelligent enough to contact.
889751
Possible, yes.  Likely, no.  We know the orbits of the satellites we put up pretty well.\n\nHowever, there IS a lot of junk orbiting the Earth - pieces of spacecraft, nuts, bolts, etc - and they are orbiting fast.  Being hit by a fast-moving piece of space trash is something they have to keep in mind and try to account for when building shuttles.
345281
None, at least no natural ones.  There may be artificial satellites sent there though.
630213
We know that Earth has life on it so that is the most likely.\n\nMars is also a possibility although I would not expect the life to be alive when we get there (but it might be possible for us to thaw it out) due to the apparent lack of water and the atmosphere being a bit too thin.\n\nEuropa might have life under the ice in a liquid water layer.  It would seem to be big enough for life to evolve and the materials that are needed for life would actually be able to exist in forms that life could use along with the tidal heating from Jupiter.  This is probably the most likely place to have life but it isn't a planet.\n\nTitan has a rather thick atmosphere and organics so it looks like a candidate although it is a bit cold and doesn't have any liquid water (though hydrocarbons might be able to substitute) so a different biochemistry might be needed.  Of course this isn't a planet so it doesn't actually answer the question.
110439
Many experiments that have help us advance in medicine are conducted in space. Our planet can be in danger of asteroids plunging into us, and can result in life on earth being destroyed, and by expolring space, we can find out and save us, so yes, it is worth it. And it's fun!
795284
I've never heard of any such thing, and neither "fluffy waterballs" nor "fluffy water balls" returns a single result on Google.  ("Waterballs" and "water balls" do, but the results are mostly about snow globes and such.)  The only "balls" of water commonly known to hit the ground are raindrops.\n\nThat being said, there's no reason to assume that water would exist on any particular planet.
918263
They have been and will be... meteors and other foreign objects entered earth have some microbes in it. Some would survived along the way if they could withstand the burning heat as they hit the earth's atmosphere.
248773
Yes. Because:\n1. Interstellar comets contain organic matter.\n2. It is statistically very unlikely that Earth is the only place where live can occur, because within one galaxy there are billions of stars in the "green zone" (the zone where life can exist) and many (if not most) of these would have terrestrial planets. Multiply that by billions of galaxies and the chances that Earth is unique are staggering.\n\nHere are two reasons I would not accept:\n1. "Intelligent life has visited Earth." People have great imaginations but most people are also nutcases. Nobody has definitely proven any encounters such that they would be taken as scientific fact.\n2. "Life on Earth started on another planet." Even though it is possible, it is speculatory.
181335
============================================================\nMagnetic Shield \n\nEarth's geodynamo creates a magnetic field that shields most of the habited parts of our planet from charged particles that come mostly from the sun. The field deflects the speeding particles toward Earth's Poles. \n\nWithout our planet's magnetic field, Earth would be subjected to more cosmic radiation. The increase could knock out power grids, scramble the communications systems on spacecraft, temporarily widen atmospheric ozone holes, and generate more aurora activity. \n\nA number of Earth's creatures, including some birds, turtles, and bees, rely on Earth's magnetic field to navigate. The field is in constant flux, scientists say. But even without it, life on Earth will continue, researchers say. \n\n"There are small fluctuations, which lead to nothing, and large ones, which we know from the geologic record are associated with reversals," said Peter Olson, a geophysicist at Johns Hopkins University in Baltimore, Maryland. \n============================================================\n\nMore at the following link:
111296
mybelief is that ice can indeed carry germs , if by germs you mean bacteria. they ould probably have to be spore forming however