O svemiru

 Kod lasera mi se cini da je glavni problem velicina tog cuda, i vjerojatno snaga koju trose:

http://news.bbc.co.uk/2/hi/science/nature/8485669.stm

http://en.wikipedia.org/wiki/HiPER

Evo o sto opcenito pise o tome:

"Laser driven systems were initially believed to be able to generate commercially useful amounts of energy. However, as estimates of the energy required to reach ignition grew dramatically during the 1970s and '80s, these hopes were abandoned. Given the low efficiency of the laser amplification process (about 1 to 1.5%), and the losses in generation (steam-driven turbine systems are typically about 35% efficient), fusion gains would have to be on the order of 350 just to break even. These sorts of gains appeared to be impossible to generate, and ICF work turned primarily to weapons research. With the recent introduction of fast ignition, things have changed dramatically. In this approach gains of 100 are predicted in the first experimental device, HIPER. Given a gain of about 100 and a laser efficiency of about 1%, HiPER produces about the same amount of fusion energy as electrical energy was needed to create it."

... energije su jake ...   :)

Hoćeš reći da i energija ima masu?

isto tako, masa je jedan od oblika energije..

A kako?

Al mislim u praksi kako pretvorit masu u energiju i obratno.

znači u teoriji se može al u praksi baš i ne

Ali piše i : It's not possible, however, to collect these newly created particles and assemble them into atoms, molecules and bigger (less microscopic) structures that we associate with 'matter' in our daily life. This is partly because in a technical sense, you cannot just create matter out of energy...

Ne može se iskoristit u neke praktične svrhe.

kako god, moja tvrdnja stoji. a to kaj bi ti energiji mjerio masu.. eh sad..

Isto tako jedna zanimljivost... kada izmjerite masu protona i neutrona zasebno i kad je zbrojite, ona je razlicita od njihove ukupne mase kad se nalaze u jezgri atoma. Proguglajte...

Pa spajanjem materije i antimaterije se sva masa pretvara u energiju.