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.addSize([768, 0], [[728, 90]]) // Smaller (laptop) screen ads .addSize([0, 0], [[300, 250], [320, 50]]) // Mobile screen ads .build(); // Homepage & listing ads const t_1 = defineIfSlot('/21821800277/pw/pw_t_hp', [[970,90],[728,90],[729,90],[300,250],[320,50]], 'div-gpt-ad-3759129-18', pubads); const t_2 = defineIfSlot('/21821800277/pw/pw_t1_hp', [[970,90],[728,90],[729,90],[300,250],[320,50]], 'div-gpt-ad-3759129-19', pubads); const t_3 = defineIfSlot('/21821800277/pw/pw_t2_hp', [[970,90],[728,90],[729,90],[300,250],[320,50]], 'div-gpt-ad-3759129-20', pubads); // Only map if they actually exist t_1 && t_1.defineSizeMapping(leaderboard); t_2 && t_2.defineSizeMapping(leaderboard); t_3 && t_3.defineSizeMapping(leaderboard); // Search results const headerSize = googletag.sizeMapping() .addSize([970, 0], [[970, 90]]) .addSize([0, 0], [[320, 50]]) .build() // Header ad (always appears) googletag.defineSlot('/21821800277/pw/pw_h_sw', [[970,90], [320, 50]], 'div-gpt-ad-5400963-20').defineSizeMapping(headerSize).addService(pubads); // Only apply targeting if values exist const article_og = getOgType(); if ( article_og ) { pubads.setTargeting( "articleTag", article_og ); } const article_type = getMetaContent( "oas:article-type" ); if ( article_type ) { pubads.setTargeting( "articleType", article_type ); } const article_category = getMetaContent( "oas:category" ); if ( article_category ) { pubads.setTargeting( "category", article_category ); } const article_sub = getMetaContent( "oas:sub-category" ); if ( article_sub ) { pubads.setTargeting( "subCategory", article_sub ); } // Add class to body if ads are visible pubads.addEventListener( "impressionViewable", function () { document.body.classList.add("has-ads"); }); pubads.enableSingleRequest(); pubads.collapseEmptyDivs(); // Start! googletag.enableServices(); }); </script>  </head> <body class="archive category category-astronomy-space category-123 not-logged-in"> <a class="sr-only" 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href="https://physicsworld.com/a/timber-japan-launches-worlds-first-wooden-satellite-into-space/" class="listing-block__image object-fit-element"> <img width="135" height="90" src="https://physicsworld.com/wp-content/uploads/2024/11/SpaceXlaunch_4-November-135x90.jpg" class="attachment-list-image size-list-image wp-post-image" alt="SpaceX Falcon 9 launch" decoding="async" srcset="https://physicsworld.com/wp-content/uploads/2024/11/SpaceXlaunch_4-November-135x90.jpg 135w, https://physicsworld.com/wp-content/uploads/2024/11/SpaceXlaunch_4-November-211x141.jpg 211w, https://physicsworld.com/wp-content/uploads/2024/11/SpaceXlaunch_4-November-317x211.jpg 317w, https://physicsworld.com/wp-content/uploads/2024/11/SpaceXlaunch_4-November-600x400.jpg 600w, https://physicsworld.com/wp-content/uploads/2024/11/SpaceXlaunch_4-November-618x412.jpg 618w, https://physicsworld.com/wp-content/uploads/2024/11/SpaceXlaunch_4-November-615x410.jpg 615w, 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211w, https://physicsworld.com/wp-content/uploads/2024/09/Gravitational-wave-317x203.jpg 317w, https://physicsworld.com/wp-content/uploads/2024/09/Gravitational-wave-625x400.jpg 625w, https://physicsworld.com/wp-content/uploads/2024/09/Gravitational-wave-644x412.jpg 644w, https://physicsworld.com/wp-content/uploads/2024/09/Gravitational-wave-641x410.jpg 641w, https://physicsworld.com/wp-content/uploads/2024/09/Gravitational-wave-635x406.jpg 635w, https://physicsworld.com/wp-content/uploads/2024/09/Gravitational-wave-308x197.jpg 308w, https://physicsworld.com/wp-content/uploads/2024/09/Gravitational-wave-257x164.jpg 257w, https://physicsworld.com/wp-content/uploads/2024/09/Gravitational-wave-300x192.jpg 300w, https://physicsworld.com/wp-content/uploads/2024/09/Gravitational-wave-128x82.jpg 128w, https://physicsworld.com/wp-content/uploads/2024/09/Gravitational-wave.jpg 700w" sizes="(max-width: 141px) 100vw, 141px" /> <span class="sr-only">Read article: What happens when a warp drive 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