(function() { try { var root = typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : Function("return this")(); var doc = root.document; var html = doc && doc.documentElement; if (html) { var supportsModernCss = !!( root.CSS && root.CSS.supports && root.CSS.supports("display", "grid") && root.CSS.supports("aspect-ratio", "1 / 1") ); if (!supportsModernCss) { var htmlClass = html.className || ""; if ((" " + htmlClass + " ").indexOf(" legacy-browser ") === -1) { html.className = (htmlClass ? htmlClass + " " : "") + "legacy-browser"; } html.setAttribute("data-legacy-browser", "true"); } } if (typeof root.globalThis === "undefined") { try { Object.defineProperty(root, "globalThis", { value: root, configurable: true, writable: true }); } catch (e) { root.globalThis = root; } } if (typeof root.CustomEvent !== "function") { var CustomEventPolyfill = function(event, params) { var customEventParams = params || { bubbles: false, cancelable: false, detail: null }; var customEvent = document.createEvent("CustomEvent"); customEvent.initCustomEvent( event, !!customEventParams.bubbles, !!customEventParams.cancelable, customEventParams.detail ); return customEvent; }; CustomEventPolyfill.prototype = root.Event && root.Event.prototype; root.CustomEvent = CustomEventPolyfill; } if (root.Node && root.Node.prototype && typeof root.Node.prototype.getRootNode !== "function") { root.Node.prototype.getRootNode = function() { var node = this; while (node.parentNode) { node = node.parentNode; } return node; }; } if (root.NodeList && root.NodeList.prototype && typeof root.NodeList.prototype.forEach !== "function") { root.NodeList.prototype.forEach = Array.prototype.forEach; } if (typeof root.ResizeObserver === "undefined") { root.ResizeObserver = function() {}; root.ResizeObserver.prototype.observe = function() {}; root.ResizeObserver.prototype.unobserve = function() {}; root.ResizeObserver.prototype.disconnect = function() {}; } if (root.Intl && typeof root.Intl.Locale !== "function") { root.Intl.Locale = function Locale(tag) { var value = String(tag || "en"); var parts = value.replace(/_/g, "-").split("-"); this.baseName = value; this.language = parts[0] || "en"; this.region = parts.length > 1 ? 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dataUrl.slice(5, separatorIndex) : ""; var payload = separatorIndex >= 0 ? dataUrl.slice(separatorIndex + 1) : ""; var mimeMatch = /^([^;]+)/.exec(metadata); var mimeType = mimeMatch ? mimeMatch[1] : "image/png"; var blob = null; try { if (metadata.toLowerCase().indexOf(";base64") >= 0) { var binary = root.atob(payload); var bytes = new Uint8Array(binary.length); for (var index = 0; index < binary.length; index += 1) { bytes[index] = binary.charCodeAt(index); } blob = new root.Blob([bytes], { type: mimeType }); } else { blob = new root.Blob([decodeURIComponent(payload)], { type: mimeType }); } } catch (e) { blob = null; } root.setTimeout(function() { callback(blob); }, 0); }; } if (root.URL && typeof root.URL.canParse !== "function") { root.URL.canParse = function(url, base) { try { if (base === undefined) { new root.URL(url); } else { new root.URL(url, base); } return true; } catch (e) { return false; } }; } if (typeof root.requestIdleCallback !== "function") { root.requestIdleCallback = function(callback) { var start = Date.now(); return root.setTimeout(function() { callback({ didTimeout: false, timeRemaining: function() { return Math.max(0, 50 - (Date.now() - start)); } }); }, 1); }; } if (typeof root.cancelIdleCallback !== "function") { root.cancelIdleCallback = function(id) { root.clearTimeout(id); }; } if (typeof root.AbortController === "undefined") { var AbortSignalPolyfill = function() { this.aborted = false; this.onabort = null; }; AbortSignalPolyfill.prototype.addEventListener = function(type, listener) { if (type === "abort") { this.onabort = listener; } }; AbortSignalPolyfill.prototype.removeEventListener = function(type, listener) { if (type === "abort" && this.onabort === listener) { this.onabort = null; } }; AbortSignalPolyfill.prototype.dispatchEvent = function(event) { if (event && event.type === "abort" && typeof this.onabort === "function") { this.onabort.call(this, event); } return true; }; root.AbortController = function AbortController() { this.signal = new AbortSignalPolyfill(); }; root.AbortController.prototype.abort = function() { if (this.signal.aborted) { return; } this.signal.aborted = true; this.signal.dispatchEvent({ type: "abort" }); }; } } catch (e) {} })();

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Helix Nebula

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一起拼 | Large Magellanic Cloud