hello every one how do they calculated the universe old wich is 13.8 billion years


Question and Answers Forum

All Questions Topic List
Matrices and Determinants Questions
Previous in All Question Next in All Question
Previous in Matrices and Determinants Next in Matrices and Determinants
Question Number 97885 by M±th+et+s last updated on 10/Jun/20

$h e l l o e v e r y o n e$ $h o w d o t h e y c a l c u l a t e d t h e u n i v e r s e o l d$ $w i c h i s 13.8 b i l l i o n y e a r s$
Commented by EmericGent last updated on 10/Jun/20
One way is use the density in function of time and see when the density reach Planck's limit
Commented by M±th+et+s last updated on 10/Jun/20

$t h a n x f o r a l l$
	Answered by smridha last updated on 10/Jun/20

	$y o u c a n p r o v e t h i s b y i n t r o d u c i n g$ $H u b b l e c o n s t a n t (H_{0}) . . .$ $b u t t h e f a c t i s o u r u n i v e r s e i s$ $e x p a n d i n g, n o t i n c o n s t a n t r a t e$ $i t i s a c c e l a r a t i n g s o a g e$ $o f u n i v e r s e c a n n o t d e t e r m i n e$ $p e r f e c t l y, t h i s i s j u s t a t h e o r i t i c a l$ $v a l u e . . .$ $w e l l I c a n p r o v e t h i s . . .$
	Commented by M±th+et+s last updated on 10/Jun/20

	$s i r y o u m e a n t h i s r u l e$ $t_{0} = \frac{2}{3} \times \frac{1}{H_{0} \sqrt{Ω_{v_{0}}}} {s i n h}^{- 1} (\sqrt{\frac{3 Ω_{v_{0}}}{2 (1 + q_{0}}})$ $a n d i h o p e i f y o u h a v e a t i m e s h o w t h e$ $p r o v e a n d t h a n k y o u .$
	Commented by smridha last updated on 10/Jun/20

	$i t s w e l l b u t y o u c a n a l s o d e t e r m i n e$ $i t i n e a s i e s t w a y l i k e . .$ $\frac{1}{H_{0}} = a g e o f t h e u n i v e r s e$ $H_{0} = \frac{73 k m / s}{1 M p c} i t m e a n s i f t h e$ $d i s t a n t {b e t}^{n} t w o g a l a x y i e s i s$ $1 M p c t h e n t h e r e l a t i v e v e l o c i t y$ $o f m o v i n g a w a y f r o m o n e t o o t h e r$ $i s 73 k m / s .$ $s o y o u c a n s e e i m e d e a t e l y t h a t$ $d i s t a n t a n d v e l o c i t y i s p r o p o r t i o n a l$ $a n d t h e p r o p o r t i o n a l i t y c o n s t a n t$ $i s H_{0} . . t h i s i s c a l l e d H {u b b l e}^{'} s l a w .$
	Commented by smridha last updated on 10/Jun/20

	$t h a n k y o u . . .$
	Commented by M±th+et+s last updated on 10/Jun/20

	$g o d b l e s s y o u s i r$
	Answered by Rio Michael last updated on 10/Jun/20

	$The truth is that we cannot actually determine$ $the actual age of the universe due to its expanding$ $nature . Astronomers tell us that the universe is$ $about 13.7 to 13.8 billion years . They do calculations$ $- Based on the oldest star (methusela star) .$ $- by measuring the rate at which the universe is$ $expanding from the big bang start point .$
Terms of Service
Privacy Policy
Contact: info@tinkutara.com

Question and Answers Forum