Recent content by JohnnyTheFox

My university used "An introduction to modern astrophysics" by Caroll and Ostlie in first year. I found it good once I had done a bit more maths. It covers most things, observational, stellar, black holes... A little on the expensive side if your not doing a course maybe. Was about £45.

I only found out last thursday night, apparently the best day for northern views. Unfortunatley with the Scottish weather I never got a chance to see it. Even during the day, (I haven't seen the sun in over a week!). Tommorow might be ok but I think its too late:frown:

This semester I'll be doing a lab project using a radio telescope to map out 21cm neutral Hydrogen in the galaxy to make a nice big image of it. (First proper hands on experiment:smile: ). Anyway that's the basic idea of it but I'm hoping in it to try to find something more specific in it...

Very refreshing read and I agree a lot with what carlB said. As a physics student I often feel some of it turns into a mathematical game. With things as elegant and clean as relativity and bits of astronomy ect some of the particle physics and QM seems like it's been made up on the spot. Well...

As far as I know gravity acts from the surface of a mass (assuming it's spherical) a bit like gauss's law of charge, everything inside cancells out. Your graviton only then emerges from the surface of the black hole so it doesn't need to escape from a singularity at infinite speed. What speed...

Well according to inflation theory a pressure creates a gravitational field so it's not an unknown idea. This is based on the idea pressure is a form of energy and therefore has mass equivilence.

As far as I know the fact the speed of light is constant for all observers had already been experimentally shown before he started his theory. But he did predict a lot from theory that was later experimentally proved in GR.

Thats some reply! Very helpful thanks. Sums up all the mains points nicley. I'm understanding its uses and how works with all our observations. It's what exactly happens at this phase change I don't quite get just yet. You meantioned a change in the Higgs Field? At the moment I see it as a...

Hey, I'm doing a discussion/essay for uni on the Inflation proscess during the big bang. I'm not looking for facts/figures, that's what the uni wants me to do:smile: but I'd like to hear a little chat about other peoples views other than reading books. So who thinks its true/false or any better...

Light moves in little particles called photons which have no mass but momentum < (the part I don't get!) so they basically hit the blades and give them momentum to move... maybe someone else can give more detail.

Hmm found a ruler. I seem to get it as it halfs with doubling the distance. So is that 1/d? Can't think tonight.

I tried it with the lights at work and it didn't seem to be I'll try again lol

Anyone ever wondered what law pespective follows? If there is one... I mean a relationship between apparent height and real height over a distance. I was going to try an experiement if I ever get round to it. I'll be disapointed if its just another inverse square law :biggrin:

Hey, simple question, can't find an answer anywhere in my books. Why does bromine not have neutral polar charge? When its a symetrical molecule? Ta

Hey, my first post here, glad I've found somewhere on the internet to discus this crazy stuff! Anyway here's my question: Matter falling into a black hole accelerates towards it under its gravity, towards the "event horizon" (or Rs=2GM/c^2) The relativistic version of the law of...