Recent content by amarante

Hey, I don't know how accurate you want it to be.. anyway here are some info that I can quickly mention. 1. The mass-radius relation of stars can be checked in the lecture here: http://www2.astro.psu.edu/users/rbc/a534/lec18.pdf and on this paper: link. The lecture is based on the book "stellar...

The announcement was really amazing! Seven earth-like planets around a single star! However, although they are located in the classical habitable zone, we need to be very cautious before calling them "habitable planets". The host star is not like our Sun and thus have some peculiarities. It is...

As people already pointed, with the current technology would be really hard, if not impossible to send humans to drill ice at Europa. It would be also necessary to protect the astronauts from the strong Jupiter's radiation field. Moreover, it is cheaper and safer to send robots to do the job...

Another cool software you can check to confirm it: Stellarium , its free, open source, and works in windows, mac and linux. You can set your location, time, adjust light pollution... really useful =)

I don't know if you already found something, but maybe this can help: https://arxiv.org/pdf/1305.3510.pdf (or references there in) Moreover, whenever you need to find some good reference in Astrophysics try using this search website: Ads-Harvard I looked for "equation of state neutron star"...

When I took the Galaxy Formation course, we basically used these two books: "Galaxy Formation" - Malcon Longair and "Galaxy Formation" - Houjun Mo . The last one is a lit bit more dense! You can find a lot of good references that both cite... Another option is to check review articles like for...

Thank you! I didn't find about the hydrogen masers before.

Hey, I kind of understand the process of the 21 cm emission of the atomic Hydrogen, I know how rare it should be but still it is detectable in our Galaxy due to the huge amount of atomic hydrogen it has. However, I was wondering if it is possible to detect the 21 cm emission line in a...

Perfect! I got it. Thank you so much! I got a solution with two possibilities, a= -1.5, or a = -0.375. Thanks!

Homework Statement What is the angular coeficient of a straight line that passes through (4,3), if it satifies x>0 and y>0, and it is one of the sides of a triangle with total area of 27 (units of area). calcule o coeficiente angular de um reta que passe por (4,3) de modo que a parte da...

thank you so much!

Hello, I am looking for any exercises about State Machines, Mealy and Moore Machines, so I could study for my test. I have already googled it, but it's kind of hard to find something. Does anyone recommend a book or site, with some good exercises? Thanks in advance

Hi, how do we know that the Universe is accelerating? I know a bit about the Hubble Key Project. But I can not find the information how they concluded that the Universe has an accelerated expansion. Did they check their values with previous observations? Thanks

Hello all, I have to prepare a seminar about fluorescent/fosforescent effect applied to engineering. Besides fluorescent lamps, and some advertisements for security. What would you suggest? Mainly in the electrical engineering area. Thanks in advance, Joao A.

Thank you for the help! I am going to look for it