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dark energy

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Post time 5-10-2008 09:29 PM | Show all posts |Read mode
apa sebenarnya dark energy ni in pyshical cosmology ni... aku tak paham2 lagi la,,,, ada sapa2 bule terangkan tak?
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Post time 5-10-2008 10:24 PM | Show all posts
para saintis memberi nama "dark" kepada energy ni, sebab diorang tak tau apa sebenarnya dark energy ni. "empty space is not nothing". dark energy ni meliputi lebih kurang 70% daripada keseluruhan angkasa. dark matter pulak meliputi 25% daripada angkasa. selebihnya adalah matter yg kita ketahui. bayangkan betapa sikitnya pengetahuan kita mengenai angkasa ni. Dark energy ni yang menyebabkan angkasa berkembang, malah lebih laju daripada dahulu. ia menyebabkan angkasa berkembang semakin laju mengikut peredaran masa. sampai sekarang kita masih tak tahu apa sebenarnya dark energy dan dark matter ni. sebab klu kita tahu, kita takkan panggil "dark" kan?
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Post time 7-10-2008 12:13 PM | Show all posts

Reply #2 cluesan's post

Yes, excellent.

N bende2 'dark' ni xdela misteri sgt. Ade cosmologist yg classify black hole tu dark matter psl matter keeps coming in, never coming out, but any information about them is lost.

Idea dark matter n dark energy dtg kire bertujuan utk 'balance'kan equation. Sebagaimana Einstein introduce cosmological constant dlm field equation die utk counteract effect universe berkembang (mse tu Einstein ingat universe ni static). Wlupun kite xtau ape cosmological constant tu sebenarnye, tp kite tau yg die mesti wujud.

N for example, dark matter plak kene introduce utk seimbangkan effect expansion universe yg agak slow klu dibandingkan dgn jumlah matter yg sgt sikit utk men'slow'kn expansion tu. So cosmologist buat hypothesis yg mesti ade matter lain wujud utk create more gravity to slow down the expansion, so they call them dark matter, n itu tugas kite utk cari mne dark matter ni.

Basically, bende2 'dark' ni bende yg kite still xtau. Satu hari nnt, klu kite tau, bende tu akan kuar r dr kategori dark.
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