<span class="searchmatch">protoplanetary</span> <span class="searchmatch">nebulae</span> plural of <span class="searchmatch">protoplanetary</span> nebula...
article on: <span class="searchmatch">protoplanetary</span> nebula Wikipedia From proto- + planetary nebula. <span class="searchmatch">protoplanetary</span> nebula (plural <span class="searchmatch">protoplanetary</span> <span class="searchmatch">nebulae</span> or <span class="searchmatch">protoplanetary</span> nebulas)...
From pre- + planetary nebula. preplanetary nebula (plural preplanetary <span class="searchmatch">nebulae</span> or preplanetary nebulas) (astronomy) A stage in stellar evolution when...
nebula Wikipedia planetary nebula (plural planetary nebulas or planetary <span class="searchmatch">nebulae</span>) (astronomy) A nebulosity surrounding a dying red giant, consisting of...
enPR: neb'jə-lə, IPA(key): /ˈnɛbjʊlə/ nebula (plural <span class="searchmatch">nebulae</span> or nebulas or (obsolete) <span class="searchmatch">nebulæ</span>) (astronomy) A cloud in outer space consisting of gas or...