Gravity Questions, Cosmic Energy & Hidden Galaxies

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This episode originally aired in 2024.
Cosmic Q&A: Gravity, Energy, and Hidden Galaxies
In this thought-provoking holiday repeat episode of Space
Nuts, hosts Andrew Dunkley and Professor Fred Watson dive into
listener questions that explore the intricate relationships between
gravity, energy, and the cosmos. With inquiries from Steve, Gus,
and Nick, the discussion spans the nature of gravity, the
implications of energy on gravitational fields, and the mysteries
of galaxy movements.
Episode Highlights:
- Gravity Without Mass: Steve from New Zealand
poses a fascinating question about the possibility of gravity
existing without mass. Andrew and Fred discuss the theoretical
implications and whether energy can contribute to gravitational
effects, referencing concepts like thermal energy and dark
matter.
- Energy and Gravity: Gus from Jessica,
Washington, raises an intriguing point about the equivalence of
mass and energy and its relationship to gravity. The hosts navigate
the complexities of gravitational energy and ponder whether the
energy of gravitational fields could influence mass.
- Hidden Galaxies: Nick from Auckland, New
Zealand, wonders if there are early galaxies moving towards us that
we can't yet see. The discussion delves into the concepts of
redshift and peculiar motion, clarifying how the expansion of the
universe affects our observations of distant galaxies.
- Listener Engagement: The episode wraps up with
Andrew and Fred encouraging listeners to keep sending in their
questions, fostering a sense of community and curiosity about the
universe.
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Stay curious, keep looking up, and join us next time for more
stellar insights and cosmic wonders. Until then, clear skies and
happy stargazing.

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