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Peta 3D alam semesta memetakan lebih dari 47 juta galaksi dan kuasar, beserta 20 juta bintang di Galaksi Bimasakti.

Los Angeles, Amerika Serikat (Xinhua/Indonesia Window) – Instrumen Spektroskopi Energi Gelap (Dark Energy Spectroscopic Instrument/DESI) milik Amerika Serikat (AS) telah menyelesaikan misi lima tahunnya untuk membuat peta tiga dimensi (3D) alam semesta beresolusi tinggi terbesar yang pernah dibuat, yang bertujuan untuk mempelajari energi gelap dan sejarah ekspansi alam semesta.

Instrumen yang dioperasikan oleh Laboratorium Nasional Lawrence Berkeley dan didanai oleh Kantor Sains Departemen Energi AS tersebut telah berhasil memetakan seluruh langit yang awalnya direncanakan untuk disurvei. Instrumen itu menyelesaikan tugasnya lebih cepat dari jadwal dan menangkap jauh lebih banyak galaksi dan bintang daripada yang diperkirakan, menurut pernyataan yang diterbitkan pada Rabu (15/4).

Dirancang untuk mengukur spektrum 34 juta galaksi dan kuasar selama lima tahun di dua pertiga langit utara (northern sky), DESI justru berhasil memetakan lebih dari 47 juta galaksi dan kuasar, beserta 20 juta bintang di Galaksi Bimasakti.

DESI dijadwalkan untuk melanjutkan pemetaan langit hingga 2028, memperluas area surveinya sekitar 20 persen, dari 14.000 menjadi 17.000 derajat persegi, dan menargetkan untuk mengumpulkan total 63 juta pergeseran merah (redshift) ekstragalaksi.

Survei yang diperluas tersebut akan mencakup wilayah-wilayah yang lebih sulit diamati, termasuk area yang lebih dekat dengan bidang Bimasakti dan wilayah yang lebih jauh ke selatan.

Laporan: Redaksi

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