Hi,
so Ive read this because I too wondered why we can see farther than ~14 billion lightyears.
https://www.google.com/amp/s/www.forbes.com/sites/startswithabang/2018/02/23/if-the-universe-is-13-8-billion-years-old-how-can-we-see-46-billion-light-years-away/amp/
The 3-step solution explains it very good, by saying we can see the age of the universe x lightyears as a base. Then almost double that because the objects we see can move at almost lightspeed, so 13,8 x almost 2 = 27. Then he says the space itself between galaxies is expanding, pushing us to 41 billion lightyears, with an additional 5 billion because of dark energy. But it still leaves me with questions:
1) He says because the object we are seeing moves at almost lightspeed so we can calculate that the distance to it now is almost 2 times that of lightyears x age of universe. But why doesnt he include the option that the observer can too move at almost lightspeed away from the object hes seeing? Wouldnt that push us from 46 billion to 46 + 13,8 Billion lightyears?
2) Why can whole galaxies move at almost the speed of light? Because of dark energy again?
3) If the space between galaxies is expanding with more than the speed of light due to dark energy, why doesnt it go into two direction, doubling the speed? Like if I imagine the space between galaxies as 3d, wouldnt that mean it pushes the galaxies away at lightspeed+ and us away from the galaxies, again at lightspeed+, so 2x lightspeed+? Putting another 13,8 billions+ on the 46 billions + 13,8 billions.
so Ive read this because I too wondered why we can see farther than ~14 billion lightyears.
https://www.google.com/amp/s/www.forbes.com/sites/startswithabang/2018/02/23/if-the-universe-is-13-8-billion-years-old-how-can-we-see-46-billion-light-years-away/amp/
The 3-step solution explains it very good, by saying we can see the age of the universe x lightyears as a base. Then almost double that because the objects we see can move at almost lightspeed, so 13,8 x almost 2 = 27. Then he says the space itself between galaxies is expanding, pushing us to 41 billion lightyears, with an additional 5 billion because of dark energy. But it still leaves me with questions:
1) He says because the object we are seeing moves at almost lightspeed so we can calculate that the distance to it now is almost 2 times that of lightyears x age of universe. But why doesnt he include the option that the observer can too move at almost lightspeed away from the object hes seeing? Wouldnt that push us from 46 billion to 46 + 13,8 Billion lightyears?
2) Why can whole galaxies move at almost the speed of light? Because of dark energy again?
3) If the space between galaxies is expanding with more than the speed of light due to dark energy, why doesnt it go into two direction, doubling the speed? Like if I imagine the space between galaxies as 3d, wouldnt that mean it pushes the galaxies away at lightspeed+ and us away from the galaxies, again at lightspeed+, so 2x lightspeed+? Putting another 13,8 billions+ on the 46 billions + 13,8 billions.
