Complexity can be objectively measured to some extent, especially in the context of information theory and algorithmic complexity. In information theory, complexity can be measured using metrics such as entropy and Kolmogorov complexity, which provide objective measures of the amount of information or computational resources required to describe a system. However, when it comes to measuring the complexity of real-world systems or phenomena, there is often a subjective element involved, as different observers may prioritize different aspects of complexity. Therefore, while certain aspects of complexity can be objectively measured, the overall assessment of complexity may still involve some degree of subjectivity. **

The time complexity of Mergesort is O(n log n) in the worst-case scenario, where n is the number of elements in the array. This complexity arises from the fact that Mergesort divides the array into halves recursively and then merges them back together in sorted order. The space complexity of Mergesort is O(n) due to the need for additional space to store the divided subarrays during the sorting process. Overall, Mergesort is an efficient sorting algorithm that performs well on large datasets. **

One can get rid of complexity by breaking down the problem or situation into smaller, more manageable parts. This can help to identify the root causes of the complexity and address them individually. Additionally, simplifying processes, communication, and decision-making can help reduce complexity. It is also important to prioritize and focus on the most important aspects, while letting go of unnecessary details. Finally, seeking input and collaboration from others can provide fresh perspectives and help to streamline complex situations. **

No, Russia's space exploration is not at an end. While Russia has faced some challenges in its space program, such as budget constraints and technical issues, it continues to be an active player in space exploration. Russia has a long history of achievements in space, including being the first country to launch a satellite and send a human into space. The country is also involved in international collaborations, such as the International Space Station, and has plans for future missions to the moon and Mars. Therefore, Russia's space exploration is far from over. **

Composing two functions has a complexity of O(1), as it involves simply applying one function to the output of the other. The time complexity does not depend on the size of the input, as the functions are applied sequentially. Therefore, the complexity of composing two functions is constant and does not increase with the size of the input. **

Space probes are sent on exploration missions using powerful rockets that launch them into space. These rockets provide the necessary thrust to escape Earth's gravity and propel the probe towards its destination. Once in space, the probe's trajectory is carefully calculated to ensure it reaches its target planet or celestial body. The probe is equipped with various instruments and communication systems to collect data and send it back to Earth. **

One popular PC game about space exploration is "Elite Dangerous." In this game, players can explore a realistic 1:1 scale open-world galaxy, trade goods, mine resources, engage in combat, and more. The game offers a vast and immersive experience for players interested in space exploration and simulation. "Elite Dangerous" has received positive reviews for its attention to detail and expansive gameplay options. **

The defining moments of space exploration include the launch of the first artificial satellite, Sputnik 1, by the Soviet Union in 1957, which marked the beginning of the space age. The Apollo 11 mission in 1969, when humans first set foot on the moon, was another defining moment that captured the world's imagination. The launch of the Hubble Space Telescope in 1990 allowed us to see deep into the universe and revolutionized our understanding of space. More recently, the successful landing of the Mars rover Perseverance in 2021 has opened up new possibilities for exploring the red planet. **