Linked Questions

17
votes
5answers
6k views

What artificial satellite has the farthest orbit around the Earth?

What is the furthest Earth orbiting satellite? What is its speed and purpose?
19
votes
3answers
2k views

Why not send Voyager 3 and 4 following up the paths taken by Voyager 1 and 2 to re-transmit signals of later as they fly away from Earth?

Voyager 1 and Voyager 2 spacecrafts are on their journey out of solar system. They collected so much of important data that helped us understand our solar system. As these spacecrafts moving out of ...
19
votes
6answers
780 views

How common is it for spacecraft to have "selfie" capability?

According to ESA: A sudden small power reduction was observed in a solar array of Sentinel-1A, orbiting at 700 km altitude, at 17:07 GMT on 23 August. Slight changes in the orientation and the orbit ...
6
votes
4answers
688 views

Can mirrors be made from fabric?

I was recently listening to a talk about JWST and other future astrophysics missions when the speaker talked about many of the size limitations associated with mirrors etc. I then thought perhaps one ...
6
votes
2answers
1k views

How did this structure fit into the Shuttle and then expand to 28 meters?

In this answer I read about the Inflatable Antenna Experiment that flew with STS-77. According to this article: Packed into the Spartan, the IAE weighed only 132 pounds; on deployment (inflation), ...
5
votes
3answers
293 views

Artificial objects longer than 40 meters in space

The ISS with its 73m x 108m Integrated truss structure, apparently, is the largest (by dimensions) artificial object in space. I know about the Krab experiment which produced two self assembly rings ...
5
votes
1answer
786 views

Why is Queqiao's dish antenna so big? (Chang'e-4 relay satellite) Largest ever on/near the Moon?

Source: Chinese language blogpost The NASA Spaceflight article Queqiao relay satellite launched ahead of Chang’e-4 lunar mission describes the communications relay satellite that will be used to ...
4
votes
1answer
188 views

What's the status and timeline for Millimetron? (Russia's 10m Deployable Antenna cooled to 6 K Earth-Space VLBI)

Comments below an answer to How does NASA's ASTHROS stratospheric telescope compare to its James Webb space telescope? link to JPL's Paul F. Goldsmith's The Renaissance of High Resolution ...
2
votes
1answer
154 views

What's the largest area dish antenna sent beyond the Earth-Moon system?

In the same vein as the question What's the largest aperture telescope sent beyond the Earth-Moon system?, I'd like to ask, what's the largest area antenna dish sent beyond the Earth-Moon system? If ...
4
votes
2answers
307 views

How a spy satellite eavesdrop on another satellite?

I recently read about Mentor-4 (also alled USA-202 or NRLO-26), a gigantic US spy satellite (operated by NRO and the CIA) with a possible dish radio antenna of 100 meters in diameter located in GEO. ...
2
votes
0answers
286 views

What are Spectr-R's major contributions to radio astronomy that could not have been done from Earth?

R. I. P. Spektr-R Spektr-R Spektr-R (37755, 2011-037A) is a Russian radiotelescope spacecraft in a very high orbit around the Earth. It's orbit is cis-lunar with ...