8月21日，国际天文学联合会第28届大会开幕式在北京国家会议中心开幕。中国国家副主席习近平出席开幕式，并发表热情洋溢的致辞。开幕式前，习近平会见了国际天文学联合会主席罗伯特·威廉姆斯等与会嘉宾。新华社记者 刘卫兵 摄     August 21，The international astronomical union 28th congress opening ceremony at Beijing's national conference center opening。Chinese vice President xi jinping, attend the opening ceremony，And delivered ebullient speeches。Before the opening ceremony，Xi jinping met with the international astronomical union President Robert Williams and the attendees。Xinhua news agency reporters LiuWeiBing perturbation

    8月21日，国际天文学联合会第28届大会开幕式在北京国家会议中心开幕。中国国家副主席习近平出席开幕式，并发表热情洋溢的致辞。开幕式前，习近平会见了国际天文学联合会主席罗伯特·威廉姆斯等与会嘉宾。新华社记者 刘卫兵 摄     August 21，The international astronomical union 28th congress opening ceremony at Beijing's national conference center opening。Chinese vice President xi jinping, attend the opening ceremony，And delivered ebullient speeches。Before the opening ceremony，Xi jinping met with the international astronomical union President Robert Williams and the attendees。Xinhua news agency reporters LiuWeiBing perturbation

    8月21日，国际天文学联合会第28届大会开幕式在北京国家会议中心开幕。中国国家副主席习近平出席开幕式，并发表热情洋溢的致辞。开幕式前，习近平会见了国际天文学联合会主席罗伯特·威廉姆斯等与会嘉宾并合影。新华社记者 刘卫兵 摄     August 21，The international astronomical union 28th congress opening ceremony at Beijing's national conference center opening。Chinese vice President xi jinping, attend the opening ceremony，And delivered ebullient speeches。Before the opening ceremony，Xi jinping met with the international astronomical union President Robert Williams and the attendees and had a group photo taken。Xinhua news agency reporters LiuWeiBing perturbation