�� ¾� �� ִ� �༺�� , ��°�� ¾翡 �� ༺�̸� �� ༺ �� ū �༺�̴�(�׸� 1-17). �Ʒ� ǥ 1-2�� Ư¡�� ¾� �� ٸ� �༺�� Ͽ� �� ǥ�̴�.

ǥ1-2. �¾�� ༺�� .

�̸�	�¾�	��	�ݼ�	��	ȭ��	��༺	��	�伺	õ�ռ�	�ؿռ�	��ռ�
�Ÿ�(�鸸km)	-	57.9	108.2	149.6	227.9	414.0	778.3	1427.0	2869.6	4504	5900
��(õkm)	1391.4	4.878	12.1	12.756	6.786	1.02	142.984	120.536	51.118	49.562	3.0
��(g)	1.987 *10³³	3.3 *10²⁶	4.87 *10²⁷	5.98 *10²⁷	6.44 *10²⁶	1.17 *10²⁴	1.9 *10³⁰	5.69 *10²⁹	8.66 *10²⁸	1.01 *10²⁹	1.5 *10²⁵
�е�(g/cm³)	1.4	5.44	5.25	5.52	3.94	2.2	1.33	0.7	1.3	1.76	1.1
��	-	0	0	1	2	-	50	53	27	13	3

�� Ϸκ�� ׸�� ⿡ �� ȭ�� ۿ�, �� ۿ� �� ׸�� ǥ�� ѷ� �ΰ� �ִ� �� ⿡ �� ǳȭ, ħ�� ۿ�� ſ� �پ�� ۿ�� Ӿ�� Ͼ��ִ� �༺�̴�. ȭ��, �� ۿ� �� (��)�� ۿ�� ̷�� Ǳ�� ִ�. �̿� �� ڼ�� 3�忡�� ٷ�� . ǳȭ, ħ�� ۿ�� ¾翡�� ۿ��, �̿� �� ڼ�� 4�忡�� ٷ��.

�ٸ� �༺�� , ��ٵ� �� Ŀ�ٶ� �� Ư¡�̶� �ϸ� �Ƹ�� ü�� ̴�. �� ǥ�� 70% �̻�� ü �� , �� ϼ� �� ϸ� �� ǥ�� ȯ�濡�� ϴ� �� Ѵ�. �� ü�� ϴ� �� ༺�̴�. �ܼ�� ¾�� Ӹ� �ƴ϶�, �ֺ� �׼��迡�� ü�� 縦 ã�� (��, �� ü�� ؼ��, ��ü�� ༺�� Ѱ��  �츮�� ü�� ༺�̴�). �̿� �� ü�� ü �� ־�� ϰ� �Ǿ��, �� ü�� 󿡼�� ٸ� �༺�� (free oxygen)�� ϰ� �Ǿ��.

�� ȭ�� ڷḦ �� ؼ�� ٿ� ��ϸ�, �� ɿ�� ؼ��ȴ�. ��, �� ʿ�� 3500 km�� ݰ�� (core)�� ְ� (�� ü �� ٰ� ��ü �� ٽ� ��еȴ�), �� 2870 km�� β�� Ʋ(Mantle)�� , �ٽ� �� 30km�� β�� Ѵ�(�Ʒ� �׸� 1-19 ��).

�̿� �� Ư¡�� ó�� �� ݱ�� �� ȭ��? �� ó�� ̿� �� ɿ� �� ־��? �� ⸦ �θ�� ־��? �׸��, �� ź�� ÿ� ��Ұ� �� ü�� ܳ�� ϱ�?

��(�� ٸ� �� ༺��)�� ؼ�� , �� θ� �޾Ƶ鿩�� Ұ��ϸ� �� .

�¾�� ߽ɿ� �� ¾�� ٱ�� ū ���� Ͽ��, �� ̼� �༺�� , �� ¾�� ٸ� �༺�� Բ� �� ̼��༺�� . �ʱ�� ¾�迡�� ̷�� ̼� �༺�� ſ� �� ̰� �� ͵�� ġ�� Ű��, �̶�� δ� ö�� ݼ� ��е�� κ� �� Ͼ��ŭ �߰ſ�� ̴�. �� ö �� ݼ� ��ҵ�� ߷� �� ̵��Ͽ� �� ߽ɿ� ��̰�, �� ߷� �� ӵǴ� ��� 浹 �� Բ� �� µ�� Ի꿰 �ϼ�� κ� �� ߱��Ͽ��. �̵� �� Ի꿰 �� е�� ǥ�� ̵��Ͽ� �� ׸� �ٴٸ� ��Ͽ��, �Ŀ� �̵�� ð��Ǿ� �� Ͽ��. �̿� �� κ� �� ſ� ö �� ߽� �� ̵�, �׸�� Ի꿰 �� ǥ�� ̵�� ȭ�� Ǿ��, �̷�� 󸶰� ��ӵǸ鼭 �� δ� ��ħ�� ɿ�� ԵǾ��.

�׸� 1-19. �ʱ� �� (��). �� ֺ�� �� ༺�� ߷¿� �� ǥ�鿡 �浹�ϰ� �ִ�.
��ó: http://ircamera.as.arizona.edu/NatSci102/lectures/lifeform.htm

�� ʱ� �̼��༺ �� �� 浹 �� ȭ�� е�� ߷¿� �� Ǳ� ��Ͽ��. �� ֺ�� 鼭 �̼��༺�� Բ� �� ߴ� �� T-Tauri stage �� ¾�ǳ�� ȱ� �� ⸦ ��ϴµ� ū �⿩�� ȴ�. �̷�� 鼭 ��Ǿ� �ٴٸ� ��ϱ� �� ϴµ�, Ư�� ٴ�� ༺�� ٱ� �ʿ� ��ϴ� � �� ̼��༺�� 浹�� ſ� ū �� Ѵ�. �� ֺ�� �� ȯ�濡 �־� �̵�� ū �� ̶� ��Ǳ� ��̸�, �� ٴ�� ź��-�ܵ��Ʈ�� ߰ߵǴ� �Ͱ� ��ϱ� ��̴�. ��Կ�� 鼭 ��緮�� ̶�� Ͽ��, ��翡�� ̵� �� Ͱ� �ʹ� �޶� �� ̷�� ź�� ǹ�� ִ� ��̴�. ��, �� ¾�迡�� ˵�� ξ� ª�� ־�� ̰�, �̵�� Ǵ� �� ٸ� �� Ȯ�� ־�, �̵� �� ؼ�� ʿ䰡 �ִ�. �� ٴٰ� �� Ƹ�� ǰ� �� 1�� ̳�� ̷�� ȴ�.

�� ź�� ٴٰ� �� ̴�. �� ź�� ̷п� ��ؼ�� , �� ˷�� ְ� ��ڵ�� ޾Ƶ��̴� �� ȭ�� ź�� ƴұ��Ѵ�. �̿� ��ؼ�� 5�忡�� ڼ�� ٷ��, �� ٸ� �� Ͽ� �򵵷� ��. �� ź�� , �� ⿡�� Ұ� ��Ǿ��.

�� ź��ϰ� ó�� ݱ�� Ӿ�� ȭ�� ִ�. �� ȭ�� ٺ� �� ٷ� �� ¾� �� پ�� ۿ��̴�. �� ޾Ҵ� ���, �� , �׸�� ߷� ��κ�� ̴�. �� ڱ�� , ��Ʋ�� , �׸�� Ǳ�� �� Ű�� ̴�. �¾翡�� ٶ�� ü�� Ƴ�� ϴ� �� õ�̴�. �� ¾� �� ̴� ��̸�, �� ü�� ٺ�� ̴�. �츮�� ̷�� 鼭 ��� ۿ�� ȭ�� ̷�鼭 ��ƾ� �� Ͽ�� Ѵ�.