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"This book guides readers (astronomers, physicists, and university students) through central questions of Practical Cosmology, a term used by the late Allan Sandage to denote the modern scientific endeavor to find the cosmological model best describing the universe of galaxies, its geometry, size, age, and matter composition. The authors draw on their personal experience in astrophysics and cosmology to explain key concepts of cosmology, both observational and theoretical, and to highlight several items which give cosmology its special character. These highlighted items are, Ideosyncratic featu. "

"Dawai kosmik (cosmic strings) merupakan salah satu jenis defeksi topologi. Dalam kosmologi, fenomena defeksi topologi ini dapat terjadi karena konsekuensi perusakan simetri spontan pada awal alam semesta. Penelitian ini mempelajari solusi dari dawai kosmik yang memenuhi persamaan lagrangian Dirac-Born-Infeld dengan suku potensialnya tak bervakum, yakni potensial yang memiliki nilai vakum pada titik yang tak terhingga. Keadaan ini berada pada fisika energi tinggi. Kami memecahkan masalah persamaan differensial orde-2 secara numerik menggunakan metode tembak.

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Cosmic strings is one type of topological defect. In cosmology, topological defect can occur because of the consequence of spontaneous symmetry breaking in early universe. This research study the solutions that satisfy the equation Dirac-Born-Infeld (DBI) lagrangian with vacuumless potential, which is the potential that has vacuum values at infinity. This is the regime of very high energy physics. We solve the second order the differential equation numerically using shooting method. "

"Perilaku eksploitatif atas alam seringkali berkaitan dengan kegiatan ekonomi ekstraktif. Untuk memperoleh lebih banyak produksi dan pertumbuhan berarti bahan baku dari alam harus diubah menjadi komoditas. Dalam tesis ini saya mengemukakan bahwa aktivitas eksploitatif atas alam juga bisa merupakan akibat diskontinuitas dalam kosmologi dengan sepenuhnya mengadopsi nilai-nilai baru, moralitas dan rasionalitas budaya baru yang kemudian menjadi dominan. Agama (dalam hal ini Kristen) berperan besar dalam mengubah ontologi animistik yang tidak melihat status hierarkis antara manusia dan alam menjadi ontologi dualistik yang menampilkan manusia sebagai makhluk istimewa di antara yang lain. Namun demikian, sebagai upaya untuk ikut serta dalam pelestarian alam, ontologi baru yang dominan ini melalui konsep penatagunaan, menempatkan manusia sebagai peran sentral dalam menjaga keseimbangan alam.

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Exploitative behavior over nature often relates to the extractive economic activities. To gain more production and growth means raw materials from nature must be converted into a commodity. In this thesis I argued that exploitative activity over nature could also be a result of discontinuity in cosmology by fully adopting new values, morality and rationality of a new culture that later became dominant. Religion (in this case Christianity) plays a big role in changing animistic ontology that sees no hierarchical status between human and nature into dualistic ontology that presents human as special beings among the others. Nevertheless, as an attempt to participate in nature conservation, this new dominant ontology through the concept of stewardship, places human as a central role in keeping the balance of nature."

"This book discusses twelve areas of active astronomical research, ranging from the nature of dark energy to the existence or otherwise of extraterrestrial civilizations, and devotes one chapter to each topic. Although astronomers tackle each of these questions using information gleaned from all possible wavelengths and sources (and this is emphasized throughout the book), in this work the author dedicates each chapter to a particular observational method. One chapter covers X-ray telescopes for investigating black holes, while another uses infrared telescopes to learn more about planetary information."