(11 Dec. 1968) — Astronaut Russell L. Schweickart, lunar module pilot of the Apollo 9 (Spacecraft 104/Lunar Module 3/Saturn 504) space mission, is seen inside Chamber “A,” Space Environment Simulation Laboratory, Building 32, participating in dry run activity in preparation for extravehicular activity which is scheduled in Chamber “A.” The purpose of the scheduled training is to familiarize the crewmen with the operation of EVA equipment in a simulated space environment. In addition, metabolic and workload profiles will be simulated on each crewman. Astronauts Schweickart and Alan L. Bean, backup lunar module pilot, are scheduled to receive thermal-vacuum training simulating Earth-orbital EVA.
Scenes from this week’s flyby of Saturn’s icy moon Dione. Tap to pause. For details and more pictures: http://go.nasa.gov/1LlUbnq
#Pluto ~ #beautiful! "Zoom in on the new, extremely high-resolution, enhanced color view of Pluto. #NASA #PlutoFlyby Full image: www.nasa.gov/newhorizons"
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When your jam comes on 😂
accept yourself (edit: Martin Matthews)
Hey there! I'm an amateur astronomer and I'm looking at saving $400-600 on a telescope, what do you think would be better, a refractor or reflector? I'm willing to carry it in my car and traveling wherever I can to get good images to observe.
Hi! That’s great that you’re looking in to getting a telescope!
Overall, reflector telescopes are better than refractor telescopes. I have a telescope myself, and its a reflector.
They are made up of mirrors, which is an advantage because mirrors can be as big and thin as you want, which makes them overall lighter and easier to move around. Refractor telescopes have lenses in them, which limits them to the size they can be since you can only make lenses of a certain size.
Placement of the lens/mirror is also imperative when talking about telescopes. In reflector telescopes, the mirror is located at the back of the telescope, so the mirror could be as big as you want and it wont bend the telescope in any way. In refractors on the other hand, the lens is located near the front. If the (objective) lens is too big, it can actually cause the telescope to bend, which is why there is limits on how big you can have the lens.
(In my reflector telescope, the lens is actually at the back behind the secondary mirror)
Of course, the main purpose of a telescope is to take in as much light as possible. So naturally, the bigger the opening at the front, the more light the telescope can take in, increasing the image quality.
That being said, both of the telescopes are great, and I’m pretty sure refractors may be a little cheaper. But keep in mind, even if you get a refractor now, there’s always an opportunity to upgrade to a larger, different kind of telescope if you continue with your observing!
Hope that helped! If not, feel free to clarify anything :)
GroupeF, a traveling French fireworks show, used LED suits and art pieces for their performance at the Buenos Aires International Festival.