how sea stars protect them self?
958855
Camouflage, regeneration and dual breeding.  A bizarre fact is a star fish has two ways to produce. One is through eggs and sperm, but  you can actually clone them if you cut them a certain way (using their regeneration property).  Fisherman realized this when they would catch them and try to kill them by cutting them up because they were felt they were a threat to what they wanted.  The more they cut them up, the more of these things they found.
767745
there are many theoretical plans to protect ourselves from impact with an asteroid. one of the most radical would be the idea that everyone has heard of, just blow it up in space. that idea consists of breaking the asteroid into to halves which pass on opposite sides of the earth. another way would be to use rocket booseters and simply push the asteroid to one side. we dont need to move it much just alter its path slightly so that it doesnt come in contact with the earth. another interesting method would be to use giant sails to catch the solar wind and like the previous idea, alter the path of the asteroid enough to not come in contact with the earth.
998666
INcredible.. The first question I've seen where everyone is right.\nYes, they are connected to the ship through strapping and bolts at the corners..\nThey do fall off. but very rarely and some are neutral buoyancy and the cause of many small ships foundering.. Usually, whale attacks get the blame.
880454
crabs, sea birds, sea stars, humans
125241
Polar bears don't have to defend themselves from anyone or anything other than human hunters, and even then often the polar bear can get the upper hand.  Polar bears tend to live at the edge of the floe ice, so they can easily swim away from anything they want to avoid.\n\nPolar bears really can't defent themselves from the main things that are really endangering them, mostly the melting polar ice cap.
420240
Most starfish reproduce in a method similar to the sponge. The starfish gather in a group (using environmental signals to coordinate the timing), metamorphose into juvenile sea stars and can begin living on the ocean floor.\n\nSea stars are developmentally (embryologically) known as deuterostomes. Since echinoderms and chordates share this same embryological pattern, they are thought to be closely related. Nevertheless, as these creatures are invertebrates and not actually fish, most marine biologists are pushing to completely replace the term starfish with sea star.
23967
Stars are massive, glowing balls of hot gases, mostly hydrogen and helium. Some stars are extremely hot, while others are cooler. You can tell by the color of light that the stars give off. If you look at the coals in a charcoal grill, you know that the red glowing coals are cooler than the white hot ones. The same is true for stars. A blue or white star is hotter than a yellow star, which is hotter than a red star. Temperature of stars range in the high hundreds to thousands degrees F. So to touch the stars that are in the sky is almost impossible, as your body would burn due to high temperatures surrounding them.
863380
On structures made of steel which are in constant contact with sea water (ships, oil rigs and piers) the most effective protection used is from 'sacrificial protection'. Blocks of magnesium are bolted to the structure at regular intervals and the sea water attacks the magnesium in preference to the steel. (This is because magnesium is much more reactive than iron) It is a quick method and cost effective if you imagine the labour (an amount of paint) needed to protect a large ship.
789785
The stars themselves don't.  It is just an illusion.  The miles of air in our atmosphere between our eyes and the star changes in temperature and humidity which makes the star look like it is flickering when it really glows at a constant rate.
757268
This is commonly known as the Rose Star or Common Sun Star.  It has 8-14 arms that are covered in small spines.  It lives on rocky bottoms anywhere from just below low tide to 330ft below the surface.  The Rose Star can detect the presence of predators and prey at a distance using chemical cues.  They are tolerant of strong sunlight and can regenerate missing limbs.
766360
The star begins as a cool cloud of gas. Under its own gravity, the cloud begins to collapse. As it collapses, it releases its gravitational energy as radiation. So a young star is cool but bright. We usually don't see these proto-stars, however, because they are generally shrouded in dust and only give off light. \n\nThe proto-star continues to collapse, and as it does, it gets hotter and hotter. "Stars" less than a percent of the Sun's mass eventually halt their collapse due to gas pressure. These stars are "brown dwarfs" or "giant planets," like Jupiter. They never ignite their hydrogen, and gradually dim away. \n\nStars larger than about 0.05 to 0.07 solar masses contract, getting hotter and hotter, until their cores are hot enough to begin burning hydrogen. When a star "turns on" its hydrogen-burning phase, we say that it has reached the main sequence, and is a true star, not a protostar, brown dwarf, or planet. The main sequence is a line of stars plotted on the HR-diagram, which represent stars which are burning hydrogen, fusing it into helium. The fusion process in the core releases heat and light, supporting the star against further gravitational collapse, and making it shine. Stars spend most of their life in one spot on the main sequence. Very massive stars live at the top of the main sequence, shining very blue and very bright, while low-mass stars are dim and red. The sun is between these two extremes. \n\nEventually, the hydrogen in the core whose fusion supports the star begins to run out. The core becomes mostly helium (the product of hydrogen fusion), and hydrogen burning moves out away from the core, forming a burning shell around the core. When this happens, the core begins to collapse again, but the outer regions of the star are pushed outwards. The star becomes brighter and cooler. This is the Red Giant stage. When the sun reaches the Red Giant stage, 5 billion years from now, it will likely grow to engulf Mercury, Venus, and the Earth. \n\nIf the star has little mass, it may end its life here, throwing off its outer layers, creating a planetary nebula out of its atmosphere, and a hot, dense "white dwarf" out of its core. The white dwarf shines only by residual left-over heat, and will eventually fade into a mere cinder. Cores of stars at least half as massive as the sun, however, will eventually collapse and heat enough to start burning helium in their cores. Once helium-burining starts, the star decends the giant branch again, reverses its swelling a bit, and lives happily fusing helium in its core, and hydrogen in a shell around the core. \n\nThen the giant dance begins again. The core helium runs out, and the star once again becomes a red giant. Stars like the sun get off the bus here, and become planetary nebulae and white dwarfs. Heavier stars begin burning carbon. This happens over and over again with heavier and heavier elements. The star ascends and descends the giant branch many times. Lighter stars that don't get hot enough in their cores to burn the next element become planetary nebulae and white dwarfs. Stars that are heavy enough eventually heat their cores enough to begin the next stage of burning and descend the giant branch for a while. For each element, the process is quicker and quicker. A star might burn Hydrogen on the main sequence for billions of years, but once this process gets to, say, silicon, the star might burn silicon for only a few days. \n\nA very massive star, more than 5-10 times solar mass, will ascend and descend the giant branch many times, until the star is ready to burn iron. But iron fusion doesn't release energy; it sucks it up. So what happens is that the star is ascending the giant branch, its iron core is collapsing and heating, until iron is ready to fuse. As soon as it does, though, it absorbs all of the heat around it, chilling the core. All fusion abrubtly stops, and the star implodes. The rebou
520482
protecting from what?
77735
Some stars might have a solar system, but not all do.  Some stars are actually two "suns" orbiting around one another (called a binary star) but appearing to the unaided eye as a single star.  Some are even three stars together, such as alpha centauri, which is the closest "star" in the sky--though it is actually three stars that look like one.  Some are stellar clusters, where many of these "suns" are all bunched close enough to appear as one star.  Some are entire galaxies, with billions of stars, but so far away that they appear to be a single star from earth.  Some are stellar clusters, where many of these "suns" are all bunched close enough to appear as one star.\n\nSome things you might think are stars are actually planets.\n\nSome are dead "suns," where the fuel for the nuclear fusion that makes the sun burn has all been expended, leaving a big mass of iron, that glows white-hot for many years before turning dark.  If you look at these so-called "white dwarves" through a powerful telescope, you can see a faint ring of matter that has been blown away in the explosion that came when the star died.  Some stars are huge, and some are small.\n\nSome of the stars we have been able to see have solar systems of their own, which we detect by the slight wobble caused by the gravitational pull of the planet (or planets) as it orbits.
446332
Depends entirely on the species of star fish.\n\nThere are about 1800 different species of sea star (Echinoderms of the Class Asteroidea) and they occur in all of the world's oceans.  Some are adapted to live in warm, coastal seas and coral reefs, others prefer deep, dark cold environs.\n\nThere are even some that are found around the super-heated waters of the deep sea hydrothermal vents also known as 'black smokers'.
965023
FIRST and foremost, simply, on the ocean you have a wider field of view. So ,  because of the increased area in view, you actually do see more stars. And i most certainly concur with other good answers, in that the lack of  'light pollution' is no doubt almost as helpfull as a good old fashioned pair of binoculars. Amazing what one can do with a little glass.
632221
They burn. Every star burns and die. But the lifetime of a star can reach up to 8-10 billions years. So, the constellations will change eventually, but nobody will even remember they're names probably. And the constellations as we know them, have the arrangement of the component stars the same only in the vicinity of our solar system. If the human kind will spread in the universe, then the constellations will be lost in oblivion. But others will appear, with every planet we will colonize and every dreaming human mind to contemplate the local night sky.
624353
gravity is everywhere - even in space.  what do you think holds everything together, keeping jupiter from sailing off towards alpha-centauri?  \n\non to your question - shooting stars are not stars, they are meteorites - varying sized "rocks" that are orbiting whatever has them stuck in a gravitational orbit until they encounter the earth's atmosphere, and burn up, which is what you see and call a "shooting star."  most never hit the ground, but when they do, look out!