The wedge-dash formula is a way of representing the three-dimensional structure of a molecule on a two-dimensional surface. It uses solid wedges to represent bonds that come out of the plane of the paper, dashed wedges to represent bonds that go into the plane of the paper, and lines to represent bonds in the plane of the paper. The space-filling formula, on the other hand, is a way of representing the three-dimensional structure of a molecule by showing the relative sizes of the atoms and how they are arranged in space. This type of representation provides a more accurate depiction of the spatial arrangement of atoms in a molecule compared to the wedge-dash formula. Both formulas are important tools for chemists to visualize and understand the three-dimensional structures of molecules, which is crucial for understanding their chemical and physical properties. **

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. **

No, it is not possible to create gravity in space. Gravity is a fundamental force that is caused by the presence of mass. In space, there is no atmosphere or solid surface to generate gravity, so it cannot be artificially created. However, objects with mass will still exert gravitational force on each other in space, following the laws of physics. **

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. **

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. **

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. **

Space probes are sent on exploration missions by launching them into space using rockets. Once in space, the probes are guided to their destination using onboard propulsion systems and navigational instruments. Mission control on Earth communicates with the probes to receive data and send commands, allowing scientists to monitor and control the mission. The probes are equipped with scientific instruments to collect data and images, which are then transmitted back to Earth for analysis. **

Both housing for people and space exploration are important in their own ways. Housing for people is essential for meeting basic human needs and ensuring a decent quality of life for individuals. On the other hand, space exploration can lead to scientific discoveries, technological advancements, and potential solutions to global challenges. Ultimately, both are valuable and necessary, and it is important to find a balance between investing in both areas to benefit society as a whole. **