Astronomy

Does anyone have any experience home brewing a radio telescope? I'd really like to make one myself, both because it seems fun and challenging, and because it would probably be cheaper than buying one of there are any consumer grade radio scopes. I'm aware of some tutorials online, and one concern that I have is that many of them are intended to output data to software. I'd like to convert the signal into something audible, so that people can actually hear the emissions. The three targets I have in mind are: the sun, Jupiter (like the JOVE project), and hydrogen emission frequencies from nebulae. Ultimately, my goal is public outreach and education rather than amateur research.

I have next to no experience working with radio anything except old AM/FM receivers and walkies. I also know next to nothing about how radio telescopes work, so if you have a particularly good resource besides googling it, I'd be greatly obliged. My questions are: did you find building/using the telescope difficult or expensive? Did you find that it was worthwhile / would you do it again? And what advice do you have for someone looking at it for public outreach?

Hey everyone! I'm putting on stargazing classes in my city with the help of the city parks dept. It involves lugging out 12" dob (we mostly hang out ~120x mag, but I have plans to really juice the magnification if we get small classes and good seeing), some binoculars, and a green laser pointer. I just did the first one last night, and I found it to be a hugely rewarding experience. Unfortunately, the class was a bit on the smaller side and not asking too many questions (I think because it was cold AF for California), and I found the energy kind of flagging halfway through. My plan has been to teach the basics of star finding, telescope use, etc. and follow the Astronomical League's Urban Stargazing program (I want to help folks get certified if they're interested). I was wondering if anyone else has done any kind of astronomy public outreach and if they had any advice to help keep the engagement up when folks are taking turns peeking through the scope. In case you might be wondering, it's not a GOTO or PUSH TO scope, I personally find that there's a bit of magic in manually slewing the scope, but it does unfortunately mean that I spend extra time bringing the scope back on target between students using it.

We ended up with probably a dozen participants, with most coming and going within about 20 mins out of the hour. Again, I think the weather was a big part of it, but I was really hoping they would find it worth it to stay. We started the night off viewing Saturn, Jupiter, Mars, and Venus, (not part of the urban stargazing program, but I wanted to include them), and moved on to showing the Pleiades and Hyades through low mag binoculars, and then on to the Orion Nebula and Theta Orionis, and finally Gamma Andromedae. Then, most people started to dip and we just kind of did requests until the end of class. Maybe I'm just enough of a dork that it would have kept me around in spite of the weather, but I worry that it wasn't interesting enough. Any advice would be appreciated.

Ars has previously written admiringly of Pettit's work, but his latest image deserves additional mention. When I first saw it, I was dazzled by its beauty. But when I looked further into the image, there were just so many amazing details to be found.

In this image, one can see the core of the Milky Way galaxy, zodiacal light (sunlight diffused by interplanetary dust), streaks of SpaceX Starlink satellites, individual stars, an edge-on view of the atmosphere that appears in burnt umber due to hydroxide emissions, a near-sunrise just over the horizon, and nighttime cities appearing as streaks.

Mars disappeared behind the full Moon for a little more than an hour Monday night, an event visible across most of North America and parts of Africa.

Dr. Ridden is the 4th author listed on the scientific paper. He is explaining the research in layperson terms. This is the kind of person to subscribe and follow. Upload/Paper/Press Release:

• https://www.youtube.com/watch?v=YhlPDvAdSMw
• https://doi.org/10.1093/mnrasl/slae112
• https://ras.ac.uk/news-and-press/research-highlights/dark-energy-doesnt-exist-so-cant-be-pushing-lumpy-universe-apart