Sky Definition and 257 Threads

Video: http://cnn.com/video/?/video/tech/2010/04/15/ia.wi.fireball.lights.up.skies.cnn I tell ya, this reminds me of the movie Armageddon :rolleyes:

Does anyone know the cause of the fireball in the sky last night? Was it a meteor? http://news.yahoo.com/video/us-15749625/19162074

Homework Statement Basically, i was told to describe the physics involved with a person who just happens to be falling out the sky...However, I'm a bit overwhelmed as to where i should start off Human mass: 54kg Earth's gravity: 9.8m/s^2 Air resistance:?perhaps negligible or would that...

Hello PF I'm hoping someone can answer this for me. I am in Ottawa, Canada and right now it is almost 2 am. I am about to go to sleep but can't help to notice why the sky is so unusually bright. It is a light peachy color. I can see the grass outside my house without any lights, it is...

I'm so over my head that I don't even know how to ask this, but here goes... The accelerometer in my device (an iPhone) gives an x,y,z vector that points to Earth. I'm using these values to determine the angle of the device relative to the horizon. Visualize a user aiming the device at a...

Hi Everyone, I have a simple question: How many arcseconds does the sun "travel" through the sky in one Tropical Year? Mark

Hello everyone! Can anyone explain why sky is blue? Thanks.

Homework Statement Members of a sky diving club were given the following data to use in planning their jumps. In the table attached, d represents the distance fallen from the rest by a sky diver in a "free-fall stable spread position" verses the time of the fall.Analyze bot qualitatively and...

what are the most recognized constellations located towards the southwest sky?

Hi I'm writing a story and I need to figure out what color the sky is on a planet orbiting Zeta Tucanae that has close to the same atmosphere as earth. just so you know Zeta Tucanae's Spectrum is F9V and Color Index is 0.576 It would be great if you can tell me how to find the color...

What color is the sky on extra-solar planet? Hi I'm writing a story and I need to figure out what color the sky is on a planet orbiting Zeta Tucanae that has close to the same atmosphere as earth. just so you know Zeta Tucanae's Spectrum is F9V and Color Index is 0.576 It would be...

Hello, Sorry if this is not the right place but I'm trying to find this for days now... I'm trying to find a working formula to determine the position (r.asc/decl) of a star at any given time and for a specific location on earth. So the parameter would be: R. Asc. of the star...

Ok, this is kind of a stupid question, but I was curious... If I lived on a planet that had an atmosphere, but a red sun, what color would the sky be? If I lived on a planet with two suns, one red, and one blue, what color would the sky be? I know some light is absorbed into the atmosphere and...

So I just got my dads old telescope out, cleaned it, and installed new motors and cleaned the primary and secondary mirrors, and it's ready for use! It's a reflector with a 4-3/8" primary mirror, and I wonder: what can I see with this thing (besides the moon, obviously)? I know this is a super...

how is the sky blue and not purple? how come purple light is not scattered , or how come the sky does not appear purple to us .

http://www.google.com/sky/

Firstly, sorry if this is a stupid question but I was just wondering if there's a way I can tell if the night sky is observable where I'm living, Dubai. I really want to get a telescope but it'll be a waste if I can't even use it here. Where I live, I wouldn't say that there's too much...

Have you ever seen three suns in the sky, if not then you have missed something... This is amazing phenomenon of nature... Check very very interesting article on this subject by clicking the link below. http://www.risethemag.com/viewarticles.aspx?aid=186

http://www.google.com/sky/#latitude=-11.802834233547672&longitude=20.91796875&zoom=6&Spitzer=0.00&ChandraXO=0.00&Galex=0.00&IRAS=0.00&WMAP=0.00&Cassini=0.00&slide=2&mI=1&oI=0" as the title indicates what is that thing near moon?

Please, answer the question, Why does the sky is blue?

Hello all. Forgive me, this has been piling up inside me for-- years. I tried a few other forums and no one can do anything but agree with me and express their equal ignorance. After reading quite a few post here, I think I may have found a group with the knowledge to answer my question...

I've wondered about this for a while: -the Milky Way which we are part of appears to be a white cloudish streak in the sky. I guess this is because the stars are so far away that it appears as a cloud of light? -But I would assume that all the stars in the Milky Way, our own galazy, must...

An eagle is flying horizontally at 7.9 m/s with a fish in its claws. It accidentally drops the fish. (a) How much time passes before the fish's speed doubles? (b) How much additional time would be required for the fish's speed to double again? Initial velocity in the x direction is...

Lets say that we have a very long, vertical, grounded, electric conductor planted at the equator (something similar with the "space tether" satellite, but here on Earth). Now we can consider that the electric wire is moving through Earths magnetic field with the Earths rotational speed at that...

There were two stars one above the other in the Western Sky just after sunset. I think they were planets. One could by Uranus but I am not sure what the other may be. I am at: lat=40.91666667 long=81.43333333 Can anyone help?

So the latest i read was that the sky is blue because that is the color of air, just like water is blue for the same reason. Now this short article i read also claimed that sunsets are red because of some property of light that causes it to show different colors when it transmits light as...

http://space.newscientist.com/channel/astronomy/cosmology/dn14546-biggest-3d-galaxy-map-to-probe-dark-energys-history.html In this cosmic cacophony, one particular note was louder than the rest, and it survives to this day as a characteristic wavelength in the clustering of galaxies...

Is 500 jumps a lot? I couldn't find any numbers online. Is 500 a lot in a mere 3 years? For someone who just does it as a hobby? She claims she did this in her teens, in the 70's. A friend of a friend has tossed this number off casually and I'm having a tough time believing it.

i am tuan anh, i am from vietnam very happy when join this forums i have one question when i see the lightning in the sky i don't hear nothing in it i don't understand why please help me thanks

What does sky cut mean?

Lets suppose I live in a planet that is located in the tip of a galaxy that is ubicated at the most distant point from our universe. What would I see if I look up to the sky at night(looking away from the center of my galaxy)? Manuel.

One summer night in 2005 I was out on my roof with a couple of my friends, and the sky was perfectly clear. We could see thousands of stars, it was amazing. We were in the countryside far away from any city lights. Well, the entire night we were just star gazing and every 5 minutes we...

Huge filaments of dark matter have been detected in a survey of thousands of distant galaxies. The discovery supports the idea that dark matter drove the formation of galaxies and larger cosmic structures and resolves a discrepancy in previous studies about how much dark matter the universe...

Sorry if this is in the wrong part of the forum but I am a budding SciFi authro with many ideas. And I just wanted to check if one of my ideas is possible, and if not, how this effect could be best recreated. I'm sure everyone has seen the Star Wars movies. Well if you remeber Star Wars...

Well part of it. Disabled spy satellite threatens Earth http://news.yahoo.com/s/ap/20080127/ap_on_go_ot/dead_satellite BobG, what's up? Or down as the case may be. Interesting to see if this has any impact on the launch of Atlantis.

If the sky could be any colour other than blue on a sunny cloudless day, what colour would you want it to be? Do you think that we are all so used to the blue colour that we simply couldn't accept any other colour and would get depressed or at least very annoyed about it?

Just seen this on sky news, quite interesting. Unfortunately the article doesn't go into much detal. http://news.sky.com/skynews/article/0,,30200-1301940,00.html

Homework Statement My physics teacher has given me a project to design some kind of device to allow landing from 5,000 feet without a parachute. So far we have been taught nothing but forces, velocity, acceleration, displacement, and vectors so I'm kind of at a loss. First step of the project...

I just saw a very bright meteor streak across the sky. I thought someone was shooting off fireworks until I remembered this.. http://www.griffithobs.org/skyreport.html I want to go out and watch some more, but it's cold outside.

Homework Statement A sky diver of mass 83.0 kg jumps from a slow-moving aircraft and reaches a terminal speed of 46.0 m/s. (a) What is the acceleration of the sky diver when her speed is 30.0 m/s? Homework Equations R=-bv mg-bv=ma The Attempt at a Solution since R is the...

if i shoot a bullet to the sky and then the bullet falls to the ground at the same point that I am standing...will i die? the bullet's start velocity should be same as final velocity...from the equation E=1/2mv^2 shows that the energy when i start shooting = energy when the bullet falls to the...

I have a basic question regarding black body cooling. Suppose a person at sea level on a clear night, were to use a hot water solar panel which is a good black body, and contain it in a box in a vacuum with a 'window' that was very good at transmission of long wave ir 'looking' only at the sky...

Would this statement be correct?

If I rember correctly, the sky seems more blue, when you look through a pair of sunglasses with orange glass. Why is that ? can anyone help out here. Orange glass is orange because it absorbs some of the blue light - but then the sky should be less blue - right ? -ZeroGravity

This happened about a month ago. I was looking out my window at the sky at about 10 o'clock at night. I was looking West and I noticed an orange light. It hadn't been there moments earlier. About thirty seconds later it was gone. I figured it might have been a plane, but it didn't move. It just...

Hi! I just saw something very unusual in the Boston sky today at 4:00 PM. Yes, in the middle of daylight. It looked a lot like a star and it was almost straight up. It then slowly moved roughly from west to east and went maybe 45 degrees in 5-6 minutes. That would give whatever it is an...

Im living in India, and I've just got a telescope, what constellations could I see? And how do I go about checking them out?

I have done a little research on the internet and I would like to ask my concept is correct or not. 1) Sky is blue As the effect of rayleigh scattering is more effective for shorter wavelength, blue light scatter more than others (e.g. red). Furthermore, our eyes are more sensitive to blue...

Suppose it's a very clear night. You take a laser-pointer, and briefly allow it to "shine" into the sky. Will the photons emitted from your laser actually make it millions of miles into space? Or will they somehow "dissipate" and not make it that far? It would be very cool to think that...

I want to learn about the night sky and the data about constilation so when I look at the sky I could figure out which star belongs to (x) constilation and its relative position with others... Is there any link which can help me out? Thanks for your help