What is the answer to this: if a star which is 100 light years away explodes right now, then after how much time will it be visible to us? - Quora
![To celebrate its 28th anniversary in space, the NASA/ESA Hubble Space Telescope took this amazing and colorful image of the Lagoon Nebula. The whole nebula, about 4000 light-years away, is an incredible To celebrate its 28th anniversary in space, the NASA/ESA Hubble Space Telescope took this amazing and colorful image of the Lagoon Nebula. The whole nebula, about 4000 light-years away, is an incredible](https://c8.alamy.com/comp/W0N0A5/to-celebrate-its-28th-anniversary-in-space-the-nasaesa-hubble-space-telescope-took-this-amazing-and-colorful-image-of-the-lagoon-nebula-the-whole-nebula-about-4000-light-years-away-is-an-incredible-55-light-years-wide-and-20-light-years-tall-this-image-shows-only-a-small-part-of-this-turbulent-star-formation-region-about-four-light-years-across-this-stunning-nebula-was-first-cataloged-in-1654-by-the-italian-astronomer-giovanni-battista-hodierna-who-sought-to-record-nebulous-objects-in-the-night-sky-so-they-would-not-be-mistaken-for-comets-since-hodiernas-observations-the-lagoon-neb-W0N0A5.jpg)
To celebrate its 28th anniversary in space, the NASA/ESA Hubble Space Telescope took this amazing and colorful image of the Lagoon Nebula. The whole nebula, about 4000 light-years away, is an incredible
![ELECTRIC LIGHT ORCHESTRA, Four light years, A new world record, Out of the blue and Discovery BOX SET WITH BOOK. 1980.First UK pressing. JET.: Amazon.co.uk: CDs & Vinyl ELECTRIC LIGHT ORCHESTRA, Four light years, A new world record, Out of the blue and Discovery BOX SET WITH BOOK. 1980.First UK pressing. JET.: Amazon.co.uk: CDs & Vinyl](https://m.media-amazon.com/images/I/71XKuMBB2ML._AC_SX355_.jpg)
ELECTRIC LIGHT ORCHESTRA, Four light years, A new world record, Out of the blue and Discovery BOX SET WITH BOOK. 1980.First UK pressing. JET.: Amazon.co.uk: CDs & Vinyl
![Only 40 light-years away — a stone's throw on the scale of our galaxy — several Earth-sized planets orbit the red dwarf star TRAPPIST-1. Four of the p Stock Photo - Alamy Only 40 light-years away — a stone's throw on the scale of our galaxy — several Earth-sized planets orbit the red dwarf star TRAPPIST-1. Four of the p Stock Photo - Alamy](https://c8.alamy.com/comp/2ATYJRD/only-40-light-years-away-a-stones-throw-on-the-scale-of-our-galaxy-several-earth-sized-planets-orbit-the-red-dwarf-star-trappist-1-four-of-the-p-2ATYJRD.jpg)