c �u t r o n g t r �n g t h � i k h � n g t h a y �i , h o �c n � ��c t �o r a � m �t t h �i i �m h �u h �n t r o n g q u � k h � � g �n g i �n g c h � n g t a q u a n s � t t h �y h i �n n a y . i �u n � y c � t h � m �t p h �n l � d o t h i � n h ��n g c �a c o n n g ��i m u �n t i n v � o n h �n g s � t h �t v )n h c �u c in g n h � s � t i �n l �i m � h � t � m t h �y t r o n g � n g h ) r �n g v i t r � l � v )n h c �u v � k h � n g t h a y �i , m �c d � n g a y b �n t h � n h � c in g c � t h � g i � i v � c h �t .
T h �m c h � n g a y c � n h �n g n g ��i t h �y r �n g l � t h u y �t h �p d �n c �a N e w t o n c h �n g t � v i t r � k h � n g t h � l � t )n h , c in g k h � n g n g h ) t �i c h u y �n c h o r �n g n � c � t h � a n g g i � n n �. T h a y v � t h �, h � l �i c � � �n h c �i b i �n l � t h u y �t n � y b �n g c � c h l � m c h o l �c h �p d �n t r � t h � n h l �c �y � n h �n g k h o �n g c � c h r �t l �n . i �u n � y k h � n g �n h h ��n g � n g k � �n n h �n g t i � n o � n c �a h � v � c h u y �n �n g c �a c � c h � n h t i n h , n h �n g l �i c h o p h � p m �t s � d � n t r �i v � h �n c �a c � c n g � i s a o c � n � t r �n g t h � i c � n b �n g : n h �n g l �c h � t c �a c � c n g � i s a o � g �n n h a u s � ��c c � n b �n g b �i l �c �y t � c � c n g � i s a o � r �t x a . T u y n h i � n , n g � y n a y c h � n g t a b i �t c h �c c h �n r �n g , s � c � n b �n g � l � k h � n g b �n : n �u n h �n g n g � i s a o � m �t v � n g n � o � c h � c �n x � c h l �i g �n n h a u m �t c h � t l � l �c h � t g i �a c h � n g s � m �n h h �n v � l �n � t l �c �y , v � t h � l � c � c n g � i s a o s � t i �p t �c c o l �i v � o n h a u . M �t k h � c , n �u n h �n g n g � i s a o d �c h r a x a n h a u m �t c h � t l � l �c �y s � l �i l �n � t , v � c � c n g � i s a o s � c h u y �n �n g r a x a n h a u .
M �t p h �n b � c n �a �i v �i m � h � n h v i t r � t )n h v � h �n t h ��n g ��c x e m l � c �a n h � t r i �t h �c n g ��i �c H e i n r i c h O l b e r s , n g ��i v i �t v � l � t h u y �t n � y v � o n m 1 8 2 3 . T h �c t � t h � r �t n h i �u n g ��i ��n g t h �i c �a N e w t o n � n � u r a v �n � n � y , v � b � i b � o c �a O l b e r s t h �m c h � c in g k h � n g p h �i l � b � i �u t i � n c h �a �n g n h �n g l � l � h �p l � c h �n g l �i n � . T u y n h i � n , � y l � b � i b � o �u t i � n ��c n h i �u n g ��i c h � � . K h � k h n l � � c h � t r o n g m �t v i t r � t )n h v � h �n t h � g �n n h � m �i m �t ��n g n g �m �u k �t t h � c t r � n b � m �t c �a m �t n g � i s a o . N h � t h � t h � t o � n b � b �u t r �i s � p h �i s � n g c h � i n h � m �t t r �i , t h �m c h � c � b a n � m . L � l � p h �n b � c c �a O l b e r s c h o r �n g � n h s � n g t � c � c n g � i s a o x a s � b � m � n h �t i d o s � h �p t h � c �a v �t c h �t x e n g i �a c � c n g � i s a o . T u y n h i � n , d � c h o i �u � c � x �y r a i n �a t h � v �t c h �t x e n g i �a c u �i c � n g s � n � n g l � n , c h o �n k h i n � c in g p h � t s � n g n h � n h �n g n g � i s a o . C o n ��n g d u y n h �t t r � n h ��c k �t l u �n c h o r �n g t o � n b � b �u t r �i � m c in g s � n g c h � i n h � b � m �t c �a m �t t r �i l � p h �i g i � t h i �t r �n g , c � c n g � i s a o k h � n g p h � t s � n g v )n h v i �n , m � c h � b �t s � n g � m �t t h �i i �m h �u h �n n � o � t r o n g q u � k h �. T r o n g t r ��n g h �p h �p � , v �t c h �t h �p t h � c � n c h �a t h � � n � n g , h a y � n h s � n g t � c � c n g � i s a o x a c h �a k �p t �i c h � n g t a . V � i �u n � y l �i �t r a c h o c h � n g t a m �t c � u h �i : c � i g � � l � m c h o c � c n g � i s a o b �t s � n g �u t i � n ?
S � b �t �u c �a v i t r �, t �t n h i � n , � ��c n g ��i t a t h �o l u �n t � t r ��c � r �t l � u . T h e o m �t s � l � t h u y �t v � v i t r � c � t � x a x �a , v � t h e o t r u y �n t h �n g c �a n g ��i D o T h � i g i � o / T h i � n C h � a g i � o / H �i g i � o , t h � v i t r � b �t �u c � t � m �t t h �i i �m h �u h �n n h �n g c h �a t h �t q u � x a t r o n g q u � k h �. M �t l � l � c h �n g t � c � s � b �t �u � l � c �m g i � c c �n p h �i c � c � i n g u y � n n h � n �u t i � n � g i �i t h � c h s � t �n t �i c �a v i t r �. ( T r o n g v i t r �, b �n l u � n l u � n g i �i t h � c h m �t s � k i �n n h � l � ��c g � y r a b �i m �t s � k i �n k h � c x �y r a t r ��c � , n h �n g s � t �n t �i c �a c h � n h b �n t h � n v i t r � c h � c � t h � ��c g i �i t h � c h b �n g c � c h � , n �u n � c � s � b �t �u ) . M �t l � l � n �a d o S t . A u g u s t i n e �a r a t r o n g c u �n s � c h c �a � n g n h a n � T h � n h p h � c �a C h � a . � n g c h � r a r �n g , n �n v n m i n h c � n a n g t i �n b �, v � c h � n g t a n h � ��c a i l � n g ��i � t h �c h i �n
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