Questions tagged [interplanetary]

Questions regarding spacecraft designed to travel between planets.

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30
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3answers
4k views

What uses would the Aldrin-Cycler have?

An Aldrin-Cycler is a vessel on an orbit on which it passes both Earth and Mars every few years without expending much fuel. At first glance this seems like a great thing for a permanent ...
39
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3answers
9k views

Why was Venus rather than Mars targeted for the first interplanetary landings?

This is a question about early planetary missions. It looks like there was only one early (unsuccessful) landing mission to Mars and that subsequently Venus became the target for interplanetary ...
4
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2answers
360 views

Generating plot of LV's performance as a function of the C3 parameter

Following my previous question about Ariane 5 performance data for escape missions, I would like to know how the plot of launch vehicle capabilities like the next one are obtained: More specifically, ...
20
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3answers
7k views

Why not travel to Mars in 2 months?

Just to clarify... I've made some research and generally know what the case is, didn't mean to make the question sound stupid... :) I know there is a thing called Hohmann transfer orbit, named after ...
11
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1answer
332 views

How are space agencies coordinating their science missions internationally?

Is there any coordination between governmental space agencies in order to achieve complementary science goals with interplanetary and other space missions? If so, is this done somewhat informally ...
1
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6answers
15k views

How would we move Venus or Mars into Earth's orbital zone? [closed]

(See the more focused version of this question: How long would it take to move Venus and Mars into Earth's orbital zone using gravity assist?) What methods and time scales might be involved in moving ...
11
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2answers
786 views

Benefit of sling shot effect with a space elevator

The upper end of a space elevator is moving considerably faster than orbital speed at that distance from Earth. As a result anything released from the top of elevator would get thrown away from the ...
15
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3answers
20k views

How to calculate delta-v required for a planet-to-planet Hohmann transfer?

How do you calculate the delta-v required to do a Hohmann transfer from a circular orbit around one body to a circular orbit around another? I'm assuming you'd need to know the masses of the two ...
13
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1answer
1k views

Are there any proposals for a permanent orbital interplanetary ferry?

I believe I read in a book once a description of a kind of interplanetary ferry that would orbit the sun and regularly pass different planets like Mars and Earth. The idea of the ferry is to have a ...
16
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2answers
3k views

What bitrates are currently achievable for communication with interplanetary space probes?

In communication with interplanetary space probes, it is clear that one has to take the delay caused by speed of light into account. Besides that, what are current limits for the data upload and ...
11
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3answers
495 views

Can orbital debris be assembled into a module for space exploration?

Wikipedia writes to say Currently, about 19,000 pieces of debris larger than 5 cm (2.0 in) are tracked, with another 300,000 pieces smaller than 1 cm below 2000 km altitude. For comparison, the ...
11
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2answers
1k views

What aspects of reentry heating 'scale as the 8th power'?

Elon Musk just commented in the post Falcon Heavy Test Flight press conference that reentering at interplanetary velocities means dealing with 'some of the heating things that scale to the 8th power'. ...
3
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1answer
721 views

Relationship of 'C3' to Delta-V for interplanetary missions

In what way does the concept of 'C3' relate to 'Delta-V' in interplanetary missions?
14
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2answers
430 views

What's the marginal cost of a second interplanetary space probe copy, like Voyager 2 or Viking 2?

During the old space race days, launching double or multiple scientific probe copies seems to have been the standard. It should have the advantage of sharing the one time fixed development costs while ...
7
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1answer
458 views

What plans does AEB (the Brazilian Space Agency) have for missions beyond GEO?

Besides the US, we focus a lot on Russia and China's space programs. India also gets a little attention. Brazil, Russia, India, and China form the BRIC group which is widely presumed to surpass G7 ...
2
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2answers
534 views

How to best patch my conics?

I thought I'd try to use patched conics to see what it's like. I'll go from LEO to LXO (low Planet-X orbit), co-planar all the way. If I understand correctly, I'll have (at least) five conics. The ...
1
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1answer
304 views

Liquid shield for spacecraft? [closed]

Could an alloy of hot or cold liquid metal be made magnetic by adding electricity to the molten ball to give it magnetic properties to wirelessly attach it to a space craft to use as a shield shown in ...
14
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2answers
3k views

Space travel using constant acceleration drive: Earth to Europa

Long story short: I'm writing sci-fi and taking my protagonist to Europa. He's got 2 weeks to one month to get there from Earth, give or take a few days. That sounds, of course, preposterous in this ...
5
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1answer
206 views

How precise are spacecraft trajectory measurements?

Interplanetary mission trajectories are frequently likened in popular media to hitting a small target with a dart from vast distances, but in reality, spacecraft don't need absurdly high precision, ...
25
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9answers
11k views

Assuming a spacecraft is traveling in a constant rate and our Astronaut will exit it to a space walk, will she be “left behind” by the spacecraft?

Lets say our Spacecraft is traveling to a remote Galaxy at a constant speed of 1/X of the speed of light. A brave Astronaut is leaving the spacecraft to a space walk, while not being attached to the ...
15
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1answer
3k views

Does a mission to Venus orbit require less propellant than a similar mission to Mars?

Gravitational attraction is determined using G (m1m2)/r^2 Which indicates the force is inversely proportional to the square of separation of the bodies Of the terrestrial planets Mercury, Venus, ...
12
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1answer
29k views

Current position of Starman

Have looked at current videos of Starman and not found data as to it's current position. Is there a site plotting the current position of Starman?
12
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1answer
277 views

How do long-flight space probe teams preserve the interest and the know-how?

Our knowledge of ballistics improves all the time: Multiple Earth-Venus gravity assists have become quite standard. We keep on planning and sending spacecraft to Lagrange points, and increasingly ...
7
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3answers
1k views

How useful is the Interplanetary Transport Network?

Wikipedia summarizes the Interplanetary Transport Network/Interplanetary Superhighway fairly succinctly, although it's pretty vague to someone who doesn't know what's going on: The Interplanetary ...
20
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2answers
1k views

Why will JUICE take 8 years to reach Jupiter, longer than any earlier spacecraft?

Galileo took six years from Earth to Jupiter. Cassini-Huygens took three years to reach Jupiter and six years to reach Saturn. New Horizons took one year to reach Jupiter. Juno was launched in 2011 ...
9
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5answers
4k views

Why haven't telescopes been sent to other planets?

Why haven't we sent telescopes to other planets? Wouldn't we be able to see further? Aren't we interested in seeing further without having to send a probe that will take years to get to where it's ...
8
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1answer
429 views

Orbital station for Mars missions

While reading through the comments on a question on the difficulty of a manned mission to Mars, people brought up the issue that sending supplies in advance would lock in the landing site. It seems to ...
6
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5answers
821 views

Could the ISS be propelled to Mars?

As the ISS has shown the ability for human habitation for extended periods, might we be able to add a propulsion unit to the ISS that would be capable of providing delta-v to send ISS to a martian ...
6
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2answers
496 views

Is this description of the “dipole drive” and how it would work physically correct?

Comments in chat have noted the recent post in the Centauri Dreams blog titled The Dipole Drive: A New Concept for Space Propulsion. In contrast to the single positively charged screen employed by ...
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2answers
182 views

Titan vs Mars for colonization

This question is along the same vein as Venus vs Mars for colonization but without the person at the table. Is Mars better than Titan which to me seems a more realistic option for colonization? With ...
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0answers
193 views

Orbit to Orbit Transport Stage

Would it be faster or cheaper to have a lander, SSTO, and/or SpaceX Mars rocket to rendezvous connect with a more efficient engine or "transport stage" or another lander, SSTO? When the spacecraft ...
17
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2answers
2k views

How do we make a round-trip journey to Mars?

I've been to Kennedy Space Center in Florida, where I saw the huge Saturn V rocket... This was used to get to people to the moon. It had a Lunar Module to propel itself on and off the moon's surface ...
15
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2answers
732 views

Is NASA launching fewer interplanetary missions?

We were discussing this in the chat room yesterday, and I thought it might make an interesting question. While missions are lasting longer today than they perhaps ever have, it seems like there are ...
11
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4answers
4k views

Accelerometer in space

If my understanding of the General Theory of Relativity is correct, according to the Equivalence Principle, forces due to gravity and acceleration are indistinguishable. If that's the case, then an ...
11
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1answer
256 views

Tracking Arc and Time for Precise Orbit Determination

It is said that for Precise Orbit Determination (POD) of interplanetary spacecrafts, generally, during the cruise phase for aiding accurate TCM (Trajectory Correction Maneuvers) planning, long arc of ...
10
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1answer
300 views

Does NASA use Newtonian model of gravity for plotting the course of Juno or general relativity?

With the huge mass of Jupiter and its fast, approximately 10 hours daily rotation, there may be substantial twisting of space-time around it. A distortion of such magnitude that may call for ...
9
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1answer
468 views

How thick must a shield be to be better than no shield at all?

Below an answer to a recent question about shielding against radiation on a trip to Mars, there was this comment from dubu (emphasis mine): [..] For high-energy particles entering dense matter, ...
8
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1answer
587 views

When will 3 outer planets line up for a flyby mission next time?

All 4 outer planets line up once every 175 years. 2 of them line up at least once every orbit Jupiter makes, about every 12 years. But how often do 3 of the outer planets line up? Here's a simple ...
7
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1answer
445 views

Ariane 5 performance data for escape missions

I would like to know the performance for escape mission of the Ariane 5 launcher. More precisely, I would like "LV Performance vs. C 3" curve. My problem is, I can find this info for a lot of ...
6
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1answer
262 views

What factors determine how long a window of opportunity opens for an interplanetary hohmann transfer?

I know that one can determine the approximate wait time for a window of opportunity to open up for an interplanetary transfer based on the relative positions and velocities of the two planets in ...
5
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1answer
299 views

How much accuracy is required to achieve interplanetary orbit without adjustment or deceleration?

It seem that "Around 15,000 tonnes of meteoroids, micrometeoroids and different forms of space dust enter Earth's atmosphere each year" some references say "Millions of meteors occur in the Earth's ...
4
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2answers
562 views

Solar Flux on Mars Surface

Considering that the Solar Flux on top of Mars' atmosphere is 590 W/m2 (following the 1/r^2 relation for sunlight), how much of this incident light actually arrives to Mars. In other words, what is ...
3
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2answers
311 views

How might the experience of a trip to Mars differ in comfort and heath impact from a stint on the ISS?

A comment below the question How will they mitigate the effect microgravity in the BFR on manned trip to mars? suggests that the trip might be as short as 3 months, which is significantly shorter than ...
3
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1answer
286 views

How is real position of probes orbiting other planets measured?

I imagine that measuring real positions and orbital elements of satellites orbiting other planets after they perform braking maneuver to get to their final orbit must be rather difficult. Especially ...
3
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1answer
129 views

How to get Ltool by Martin et.al?

I am just starting work on dynamics of CRTBP. Over several papers I see that "Ltool" is used for trajectory design, But I am unable to find over internet. Can somebody help me to identfy how to ...