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Yes, and they confirmed it was the same galaxy using spectroscopy: https://webbtelescope.org/contents/media/images/2022/035/01G7HRMY93K0BCCBKCABAQH0V7 https://w
by thamer 4y ago
Yes, and they confirmed it was the same galaxy using spectroscopy: https://webbtelescope.org/contents/media/images/2022/035/01G7HRMY93K0BCCBKCABAQH0V7 https://webbtelescope.org/contents/media/images/2022/035/01G...
- londons_explore 4y agoPresumably the path lengths are probably not identical... That means we might be able to see the same galaxy twice at different points in time? That should be a really good way to check our models are accurate!
- leeoniya 4y agoi read somewhere recently that this difference in path lengths can be measured in days, depending on distance and how off-center the lensing is.
- lasc4r 4y agoThat's pretty amazing, I'd certainly not expect more than a small time shift since it still managing to get the same light source to the same location to be detected.
- btilly 4y agoThe lensed light has generally traveled for billions of years, and wound up being separated by thousands of light years before the gravitational lensing. Two paths taking days apart DOES count as only a small time shift!
- leeoniya 4y agoor decades https://news.berkeley.edu/2015/03/05/distant-supernova-split-four-ways-by-gravitational-lens/ https://news.berkeley.edu/2015/03/05/distant-supernova-split...
- victor9000 4y agoInteresting, it should be theoretically possible to use gravitational lensing to view a past version of earth, no?
- beckingz 4y agoYou would probably need a telescope larger than earth to do this.
- Spare_account 4y agoUsing interferometery of orbiting observatories (potentially on solar orbits, to leverage the entire diameter of the solar system), this is conceivably possible
- tomjakubowski 4y agoHaving just visited Mt. Wilson, and learning about CHARA, this idea sounds fantastic.
- mortehu 4y agoIs there anything we can do deliberately to use gravitational lensing other than aiming a telescope at a part of the sky where this is happening by random chance?
- holoduke 4y agoWould there be fotons of walking dinosaur still floating around into our direction after making a complete u turn somewhere?
- jagraff 4y agoThis has actually been done before - scientists have been able to image the same supernova multiple times from a gravitationally lensed galaxy: https://www.universetoday.com/151581/astronomers-saw-the-same-supernova-three-times-thanks-to-gravitational-lensing-and-in-twenty-years-they-think-theyll-see-it-one-more-time/ https://www.universetoday.com/151581/astronomers-saw-the-sam...
- seanw444 4y agoNow that is fascinating.
- antognini 4y agoThese kinds of observations have frequently been made for lensed quasars. Quasars are fairly stochastic and have random bursts in their brightness. If you see multiple images of the same quasar, you can see one of the images get brighter and then some time later (usually of order days) you can see the other image get brighter. By measuring the time delay and the separations between the images you can get an estimate of the Hubble constant.