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The surface of the Earth is the shore of the cosmic ocean. From it we have learned most of what we know. Recently, we have waded a little out to sea, enough to dampen our toes or, at most, wet our ankles. The water seems inviting. The ocean calls. Some part of our being knows this is from where we came. We long to return. These aspirations are not, I think, irreverent, although they may trouble whatever gods may be. The dimensions of the Cosmos are so large that using familiar units of distance, such as meters or miles, chosen for their utility on Earth, would make little sense. Instead, we measure distance with the speed of light. In one second a beam of light travels 186,000 miles, nearly 300,000 kilometers or seven times around the Earth. In eight minutes it will travel from the Sun to the Earth. We can say the Sun is eight light-minutes away. In a year, it crosses nearly ten trillion kilometers, about six trillion miles, of intervening space. That unit of length, the distance light goes in a year, is called a light-year. It measures not time but distances - enormous distances.

Ketersediaan

000405-eB-0122 520 SAG c 000405-eB-0122 Perpustakaan SMA Kolese Loyola Semarang Tersedia

Informasi Detail

Judul Seri: -
No. Panggil: 520 SAG c
Penerbit: : .,
Deskripsi Fisik: 225 hlm
Bahasa: English
ISBN/ISSN: -
Klasifikasi: 520
Tipe Isi: text
Tipe Media: computer
Tipe Pembawa: online resource
Edisi: -
Subjek: Astronomi
Kosmos
Info Detail Spesifik: -
Pernyataan Tanggungjawab: -

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Lampiran Berkas

Cosmos

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