Recent content by joseamck

Space is 3D where we have (x,y,z), then we add the third component, time or t, then we have (t,x,y,z) a 4D; which is why we call it Space-time. This t is most affected by massive objects such as black holes which not only bent space but also time.

I think of it as if a distribution is Gaussian or Poisson... then which one is better to use? and in what sense does accurate now means? just saying

Great!

does it matter what the background is if all images were taken with a g filter? I don't understand the question.

I have astronomical images taken using a CCD camera and telescope using a g filter. In the images I have stars with what is called instrumental magnitudes (from the photon count in each pixel). My question is if there is a way to change this g instrumental magnitude to a real V magnitude. I...

In terms of temperature and luminosity that's what the HR diagrams shows, the star's classifications.

Blue means hotter than orange flame. That is why blue stars are hotter than yellow/orange stars just like Betelgeuse (red giant) which is located in the orion constellation. The cause of the blue flame is just that is coming out really hot due to the introduction of more hydrogen or oxygen atoms...

Ok here is just a suggestion. Try using 50 as the angle and recalculate the velocities. This I think they were trying to say that the angle of the wind gust it makes with the north is 40 degrees.

Hello. I see your attempt to this problem. To deal with an object going to some velocity at an angle, I think of this as a vector problem. (look in picture) Then we need to separate the velocity in components, thus V_{xi} = 7\cos(35) and V_{yi} = 7\sin(35) This is clearly a 2D...

I'm currently in my last semester to obtain a MS in physics with a strong background in Astronomy. Sorry Nabeshin but this is Slightly wrong. Phyxsean if you are into physics and astronomy try considering also learning programming because astronomy also requires to model data, map galaxies...

Ok first you need to understand the COM formula and see how it works. Basically you need to specify a coordinate to tell where the COM is. That means you need to find the center of mass in the x direction, y direction, and z direction of the system or object. So we start by separating...

the metric is ds=dx^2+dy^2-dudv+2H(x,y,u)du^2 I know that in vacuum T^{σβ} = 0

Hello, I'm having problems solving this problem I got in class. I want to learn the concept and how to approach the solution. Here it is: Consider the metric ds=dx^2+dy^2-dudv+2H(x,y,u)du^2 What form must the function H have for this metric to represent a plane gravitational wave...