PBS Space Time Season 2017 Episode 38 The Missing Mass Mystery

PBS Space Time season 2017 episode 38 explores the mystery of missing mass in the universe. The episode delves into the understanding of gravity and how it is still a mystery in modern physics. Scientists have long observed that the mass of visible matter in the universe cannot account for the observed gravitational effects. This unexplained phenomenon suggests that there is some unseen matter that must exist, which is referred to as dark matter.

The episode begins by explaining the principles of gravity as we currently understand them. In Newton's conception of gravity, the force is directly proportional to the mass of two objects and decreases as the distance between the objects increases. However, Einstein's theory of general relativity presented a new understanding of gravity that demonstrated how objects distort the fabric of space-time, affecting the motion of other objects.

The episode discusses how the observed gravitational pull in our galaxy and beyond suggests that there must be some unseen matter that is affecting the motion of surrounding galaxies. Even though it cannot be observed or detected directly, scientists have used the gravitational effects of dark matter to map its location and distribution throughout the universe.

The episode features interviews with leading physicists and cosmologists who share their insights on the properties of dark matter and how it might interact with other forms of matter. The episode highlights how most galaxies appear to be surrounded by a halo of dark matter that offers stability to the galaxy. Without the gravitational effects of dark matter, galaxies would fly apart, and the universe would look drastically different from how we observe it today.

The episode discusses how scientists are searching for ways to detect dark matter directly. One common method involves using underground detectors that are incredibly sensitive to the tiniest interactions of dark matter particles with matter. However, so far, these experiments have not produced any direct evidence of dark matter. Scientists are also exploring alternative theories that might explain the gravitational effects that we observe without needing the existence of dark matter.

The episode concludes by emphasizing the importance of understanding the nature of dark matter as it plays a significant role in the formation and stability of the universe. The search for dark matter and the answers it holds will take time and require more experiments and observations. Nonetheless, the mystery surrounding dark matter presents an exciting opportunity for physicists and cosmologists to explore new theories and expand our understanding of the universe.

Overall, PBS Space Time season 2017 episode 38, "The Missing Mass Mystery," provides an insightful and engaging exploration of the enigma of dark matter and its implications for the universe. The episode presents complex topics in an accessible way, making it an ideal resource for anyone interested in physics, astronomy, and cosmology.