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#422: Dim Lights & Dark Matter: Cosmic Questions Answered

#422: Dim Lights & Dark Matter: Cosmic Questions Answered

Space Nuts: Astronomy Insights & Cosmic Discoveries vor 2 Jahren

0:00

29:52

Join Andrew Dunkley and Professor Fred Watson for another
enlightening episode of Space Nuts Q&A. This week, we tackle a
variety of listener questions that delve into the fascinating
intricacies of space science and astronomy.

First, we revisit a question from Alan about the detectability of
light at one candle power of an LED in space. Fred breaks down the
calculations and assumptions, providing insights into how far such
a light source would be visible, even with the Hubble
Telescope.

Next, Nate from Queensland asks about bolometric luminosity and its
implications for predicting changes in stars, such as supernovae.
Fred explains the concept of bolometric measurements, the use of
bolometers, and whether there's a standard way to predict changes
in a star's luminosity.

David from Melbourne brings up Hawking radiation and its potential
connection to dark matter and dark energy. Fred clarifies the
nature of Hawking radiation and discusses recent research linking
black holes to dark energy, albeit without involving Hawking
radiation.

Martin from Maryland poses a question about the hazards of
near-light-speed travel for spacecraft and their biospheres. Fred
explores the potential dangers, including nuclear interactions and
radiation, that could arise from such high-speed travel.

Finally, Ryan from Delaware inquires about the feasibility of
refuelling or repairing the James Webb Space Telescope. Fred
explains the challenges due to its location at the L2 point and the
economic considerations that make such missions unlikely.

Tune in to this episode of Space Nuts for these intriguing
discussions and more. Your questions drive the conversation, so
keep them coming!

00:00:00 Professor Fred Watson answers questions on this episode of
Space Nuts

00:01:54 How far away could you see one candle power led with the
Hubble telescope

00:06:00 Nate from Queensland asks some questions about volumetric
luminosity

00:07:20 Bolometric brightness is the brightness of something
measured over its whole spectrum

00:13:50 Is hawking radiation anything to do with dark matter or
dark energy

00:15:54 What are the major hazards to spacecraft as they approach
relativistic speeds

00:21:10 Ryan from Delaware has a question about the James Webb
space telescope

00:27:58 Andrew: Thanks to everybody who contributed this week to
Space Nuts q and a

00:29:15 This podcast is available on iTunes, Spotify and
iHeartRadio

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