[[Image:Bruce McCandless II during EVA in 1984.jpg|thumb|पृथ्वीचा जन्म झाल्यानंतर सुमारे साडेचार अब्ज वर्षांनी पृथ्वीवरील जीवसृष्टीने ग्रहापासून लांब भरारी घेतली. इतिहासात पहिल्यांदाच अंतराळातून पृथ्वीचे दर्शन घेतले गेले.]]

१९४०च्या दशकापासून आजमितीस मोठ्या गतीने बदल घडत आहेत. तंत्रज्ञानातील मोठ्या वाटचालींमध्ये [[आण्विक शस्त्रे]], [[संगणक]], [[अतिसूक्ष्मतंत्रज्ञान]], आणि [[जनुक तंत्रज्ञान]] यांचा समावेश आहे. Economic globalization spurred by advances in communication and transportation technology has influenced everyday life in many parts of the world. Cultural and institutional forms such as [[democracy]], [[capitalism]], and [[environmentalism]] have increased influence. Major concerns and problems such as [[disease]], [[war]], [[poverty]], violent [[Political radicalism|radicalism]], and more recently, human-caused [[Global warming|climate change]] have risen as the world population increases.

In 1957, the [[सोवियेत संघ]] launched [[Sputnik 1|the first artificial satellite]] into orbit and, soon afterward, [[Yuri Gagarin]] became the first human in space. [[Neil Armstrong]], an [[United States|American]], was the first to set foot on another astronomical object, the Moon. Unmanned probes have been sent to all the known planets in the solar system, with some (such as [[Voyager program|Voyager]]) having left the solar system. The Soviet Union and the United States were the primary early leaders in space exploration in the 20th Century. Five space agencies, representing over fifteen countries, have worked together to build the [[International Space Station]]. Aboard it, there has been a continuous human presence in space since 2000.




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