New Images Reveal Knots in 1181 Supernova Remnant Pa 30
The sharpest images yet of supernova remnant Pa 30 show roughly ten times more gas filaments, revealing tight chains of knots instead of smooth streaks. Pa 30 is linked to a supernova observed in 1181 and contains a surviving star. Astronomers say the detailed view could help identify other stellar explosions that left surviving stars behind.
Pa 30 lies about 7,500 light-years away, making it relatively nearby. A volunteer researcher found it in 2013; later work tied it to the 1181 explosion recorded in Japanese, Chinese, and Arabic sources. That connection made it one of only five pre-telescope supernovae whose remnants had remained unidentified.
Using Gemini North on Mauna Kea, researchers studied red sulfur and blue-green oxygen emission. The sulfur data resolved about ten times more filaments than earlier observations. Each knot is large enough to contain the planetary region out to Neptune about ten times over. The team was co-led by Tim Cunningham and Ilaria Caiazzo, and the study appeared in The Astrophysical Journal.
Count: First para: Pa(1) 30(2) lies(3) about(4) 7,500(5) light-years(6) away,(7) making(8) it(9) relatively(10) nearby.(11) A(12) volunteer(13) researcher(14) found(15) it(16) in(17) 2013;(18) later(19) work(20) tied(21) it(22) to(23) the(24) 1181(25) explosion(26) recorded(27) in(28) Japanese,(29) Chinese,(30) and(31) Arabic(32) sources.(33) That(34) connection(35) made(36) it(37) one(38) of(39) only(40) five(41) pre-telescope(42) supernovae(43) whose(44) remnants(45) had(46) remained(47) unidentified.(48) Second: Using(49) Gemini(50) North(51) on(52) Mauna(53) Kea,(54) researchers(55) studied(56) red(57) sulfur(58) and(59) blue-green(60) oxygen(61) emission.(62) The(63) sulfur(64) data(65) resolved(66) about(67) ten(68) times(69) more(70) filaments(71) than(72) earlier(73) observations.(74
[paragraph] Need maybe blank line between paragraphs? "2 short paragraphs" under 120 total. We can include two paragraphs. Good. Need ensure no copying source phrasing. Some terms unavoidable: Pa 30, Gemini North, Mauna Kea, Tim Cunningham, Ilaria Caiazzo, The Astrophysical Journal. Fine. "pre-telescope supernovae" maybe source "before the telescope era" not exact. "remnants had remained unidentified" source "remnants had long remained unidentified" close? I wrote "had remained unidentified" maybe okay. "planetary region out to Neptune" source "planetary region of our solar system could fit in each knot about ten times with room to spare" and "region extending out to Neptune's orbit". My phrase "planetary region out to Neptune" close but original enough? Maybe okay. Could rephrase "the space spanning from the Sun to Neptune’s orbit" but source. Hmm. Need "entirely original wording, never copying source phrasing." Avoid exact phrases. Let's revise to be safer. Expanded: Pa 30 sits r