Is it possible to rain at night with few stars peeking in the sky?
What causes rain to happen is this: the rising of moist air and the further cooling by adiabatic effect. Hence, all rain (and snow) happens first upward, until the mass of the growing droplets is big enough to overcome the rising by gravitation. In the extreme case that rain rises all the way to the top of the troposphere, it freezes into pellets of ice and when it finally comes down, it is as hail. The rising of the air can be caused either by the fact that the air is warm and, therefore, less dense or, by the so-called orographic effect of a wind passing over a high terrain like, a mountain range. To answer your question: if it rains, the sky above you must be cloudy. But you may see stars if the sky is clear on the side of the cloud. This happens, typically, when a cold front passes, creating rain showers from isolated cumulonimbus clouds.
If a purple star was possible, would it be hotter than a blue star?
Purple is merely a composite of red and blue, not a monochromatic color. The term should be replaced for violet.Actually, violet stars exist.As well as green stars.Stars beyond blue are indigo and violet. And yes, they are hotter than blue stars. Their colors indicate their age and temperature and their life stages behave like a spectrum: Blue stars are the youngest and the hottest while red stars are the oldest and the coolest.We only see a visible light spectrum between infrared and ultraviolet — two spectra which are not visible to our perception.The color of violet and green stars can’t be seen because of the way a human eye perceive light.Like most kind of visible lights, stars (just like a flashlight) do not emit a single wavelength, meaning they emit all kinds of color. One type of wavelength must be strongest to emit a primary color, unlike laser which emits a pure wavelength (i.e. red laser has only red wavelengths).A green color is located at the center of the visible light spectrum, which means green stars emit some light in all the possible colors. Therefore, a green star would appear white — a combination of all colors.We can’t easily see violet stars at light-year distances because violet light has a very short wavelength so our eyes would be more perceptive to blue light. A star emitting a violet light also sends out blue light because the two colors are next to each other in the visible light spectrum. Since violet light has shorter wavelength than blue light, the human eye would see a blue light from a violet star.
Is it possible to see rainbows during the night?
Actually, we can. Got surprised. The sun is not the only source of light that can create these bows. We see "rainbows" quite often, whether an actual arch of colored raindrops or the reflection off of your prismatic bike, glass of water, phone or car. Lunar rainbows, or moonbows, form in the very same way as the "ROYGBIV" rainbows we are taught about in school – except the light comes from the moon. Rainbows and moonbows are all about location.A lunar rainbow illustrationA moonbow (also known as a lunar rainbow or white rainbow), is a rainbow produced by moonlight rather than the sunlight. Other than the difference in light source, its formation is exactly the same as for a solar rainbow: It is caused by the refraction of light in many water droplets, such as a rain shower or a waterfall, and is always positioned in the opposite part of the sky from the moon relative to the observer.Moonbows are much fainter than solar rainbows, due to the smaller amount of light reflected from the surface of the moon. Because the light is usually too faint to excite the cone color receptors in human eyes, it is difficult for the human eye to discern colors in a moonbow. As a result, a moonbow often appears to be white. However, the colors in a moonbow do appear in long exposure photographs.Moonbows are most easily viewed when the moon is at or nearest to its brightest phase Full Moon. For moonbows to have the greatest prospect of appearing, the moon must be low in the sky (at an elevation of less than 42 degrees, preferably lower) and the night sky must be very dark. Since the sky is not completely dark on a rising/setting full moon, this means they can only be observed 2 to 3 hours before sunrise (a time with few observers), or 2 to 3 hours after sunset. And, of course, there must be rain falling opposite the moon. This combination of requirements makes moonbows much rarer than rainbows produced by the sun. Moonbows may also be visible when rain falls during full moonrise at extreme latitudes during the winter months, when the prevalence of the hours of darkness give more opportunity for the phenomenon to be observedNote-Few facts have been taken from Wikipedia and National and Local Weather Radar, Daily Forecast, Hurricane and information from The Weather Channel and weather.comImages used here has been taken from Google- Thanking You(Prajjwal pathak)
Does every star have its own rainbow?
If you mean rainbow in the sense that the star emits light of all frequencies, then yes, every star emits at least a little bit of yellow, orange, red, and so on. The reason why stars do not seem to emit green light or purple light is that other wavelengths overshadow these ones.If you mean rainbow in the more common sense though, like the ones you see in the sky, then no, not all stars have their own rainbows, but most should. In order for a rainbow to appear to an observer light must be refracted through water droplets the same way light splits through a prism. Although hydrogen and oxygen is pretty common in the universe, (meaning there must be a lot of water), not every solar system has the ice particles needed for rainbows to occur, though if the star is bright enough it may cause rainbows in adjacent systems where there is water.
Is a Holodeck (like in Star Trek: TNG) possible?
As established by the Star Trek: The Next Generation Technical Manual, the holodeck is a combination of holography, replicators, and force fields designed to simulate an experience.We have a difficult time producing holograms in full color that don’t have rainbow effects due to diffraction. And animation of a holographic image is still in its infancy.[sidebar: That pyramid thing that you place under or over your phone to see ‘3D’ images is not actually 3D—it is a set of four 2D views mapped onto a virtual four-sided prism by the reflection of the pyramid surface. A real three-dimensional image would have a slightly different view from any angle.]However, the image component is nonetheless the closest to being reality of all aspects of the holodeck. Force fields such as tractor and repulsor fields are mostly theoretical at this point; the few demonstrations that even begin to approach such things involve very small areas of effect, and use technologies that would be impractical to use at the scales seen in the holodeck.And replication is completely beyond our grasp at the moment. In-universe, replication is a specialized form of transporter technology, that takes raw matter and conforms it to a specific matrix—that of a known substance or item. It is of a limited ‘resolution’ compared to transporters; transporters may be considered to be a matter transfer technology under continuous control, whereas replication can be considered to be controlled by a more discrete and quantized matrix. An apt comparison might be the difference between extremely high-fidelity analog audio versus a relatively low-fidelity digital audio format such as 8000Hz 8-bit.Out-of-universe, we have no idea how to convert matter on the macro scale. We are barely able to accomplish the teleportation of a single quantum, and it is unclear if that accomplishment is actual teleportation or a result of quantum entanglement effects.tl;dr: No.
Is it possible for planets and stars to be enormous biological creatures?
No. The definition of biology is a living organism and the vital processes it entails to survive. You can find such organisms in the study of botany and zoology. Not every element or molecule is alive. You can find nonliving matter in the study of geology and chemistry. A quick study of these sciences shows there is a difference between organic and inorganic matter. The composition of stars is inorganic gasses. The composition of planets is inorganic material with the possible potential of organic material on or near the surface. Don't allow flawed emotions to confuse your understanding of your environment or your ecosystem. It was only when things were not understood that we gave them mythological names and powers. To do so today would show a lack of education and knowledge.
Have you ever saw a rainbow and a shooting star within the same 24 hour period?
I suppose its POSSIBLE to see both a rainbow and a shooting star within the same 24 hour period, but I feel that it would be Very Rare... Rainbows appear, for instance, when it rains lightly and the weather is still sunny. The sunlight passes through the water droplets (or even mist) in the air. Each water droplet has a tiny prism in it, in which when light passes through the 'prism', it emits the colours of the rainbow (red, orange, yellow, green, blue, indigo and violet). Then again, a shooting star or falling star is the common name for the visible path of a meteoroid as it enters the atmosphere. A shooting star is also broken pieces of meteors that have become broken off in space... So, what I'm guessing is that you can only see a rainbow during the day, and a shooting star during the night...? But as to answer your question, No, I've never seen a rainbow and a shooting star within the same 24 hour period... :P I just gave all that info up there for fun.. I've never even seen a shooting star before. Would love to, though. :D
There's a flashing rainbow star in the sky by my house. What is it?
What AM said is correct...The light from the stars get distorted by the turbulence in our Earth's atmosphere hence you get what you see...even if a very powerful pair of binoculars the star remains just a speck of light.
What does at the end of the rainbow mean?
(Kim E Ellingsen, ask before you use).This is folkloristic in nature, where the story holds that there's a pot of gold at the end of the rainbow. Now, as all knows it's impossible to reach the end of a reflection (the rainbow is a reflection of the sun through myriads of raindrops), and as such the phrase depicts an unattainable boon or goal.
Why does a distant star appear to have a rainbow hue around its edge when I look through my telescope?
Hello there,Chromatic aberration of an image formed by a lens comes from the near-white light of the object being differentially refracted by the lens, as if the lens were acting like a stack of glass prisms, forming a spectrum.Converging lenses are particularly susceptible to this.By combining the lenses of an eyepiece in the form of both converging and diverging lenses, of different refractive indexes, chromatic abberation is almost totally resolved. Two of the best designs for reducing this optical effect are the Plossl and Nagler eyepiece designs :Plossls are relatively widespread, and these days very good value for money - I use a 40mm, a 20mm and a 12.5mm for preference. I also use a slightly older design the 20mm Kellner, which is a great planetary and bright deep-sky eyepiece.Owners of older Celestron telescopes will be familiar with these.In the majority of reflector telescopes, there is only the mildest hint of chromatic aberration - even in a lensed Schmidt-Cassegrain and Maksutov-Cassegrain.[Maksutov Cassegrain, a lot like mine - note big spherical front corrector lens]Newtonians, of course, have no chromatic aberration at all.[Newtonian Telescope - the original magic mirror]Refractors are a different story. Traditional refractor telescope had long focal lengths, not only for high magnification, but also to minimise chromatic aberration as far as is possible.With modern Flourite-glass, its possible to build a short-tubed refractor which permits high magnification with minimal aberration - these tend to be very expensive (fluorite glass is not cheap, and can be difficult to work and grind to shape). That said, they are prized by amateur astronomers, and are of growing interest to professionals.Vixen and Takahashi tend to make the most admired instruments. INTES is another commercial maker. Mainstream manufacturers GSO, Celestron and Meade also feature 4″ Fluorite refractors for sale. They are very good telescopes, and worth considering for purchase if your main interest lies with the planets and moon, as well as bright depp-sky astrophotography.Hope this helps, my 2c worth.