# Space propulsion without mass ejecting

• B
• leafy
In summary, the conversation discusses the possibility of using longitudinal waves to propel a box in outer space by giving pulses at one point and absorbing them at another. However, this idea conflicts with Newton's third law and is considered a forbidden topic, as seen in the thread about EMDrive and other reactionless drives on the Physics Forums website.
leafy
TL;DR Summary
We have a box sit in outer space. Inside a box is a slinky connect at two points A and B. Pulses of longitudinal wave is given at A and absorbed at B. Can this system propelled through space?
When the pulse is given at A, the box move to the right. When it is absorbed at B, the box stop.

leafy said:
Summary:: We have a box sit in outer space. Inside a box is a slinky connect at two points A and B. Pulses of longitudinal wave is given at A and absorbed at B. Can this system propelled through space?

When the pulse is given at A, the box move to the right. When it is absorbed at B, the box stop.
Newton's third law is the problem here.

leafy said:
Summary:: We have a box sit in outer space. Inside a box is a slinky connect at two points A and B. Pulses of longitudinal wave is given at A and absorbed at B. Can this system propelled through space?

When the pulse is given at A, the box move to the right. When it is absorbed at B, the box stop.

Reactionless Drives are on the list of Forbidden Topics. Thread is closed.
Forbidden Topics said:
EMDrive and other reactionless drives

Nik_2213

## 1. How does space propulsion without mass ejecting work?

Space propulsion without mass ejecting, also known as propellantless propulsion, works by using an external energy source to create a force that propels a spacecraft forward. This is often achieved through the use of electromagnetic fields or radiation pressure.

## 2. What are the advantages of space propulsion without mass ejecting?

One of the main advantages of space propulsion without mass ejecting is that it eliminates the need for carrying heavy propellant, which reduces the overall weight and cost of the spacecraft. It also allows for longer missions, as there is no need to refuel.

## 3. Are there any limitations to space propulsion without mass ejecting?

One limitation of space propulsion without mass ejecting is that it currently requires a large amount of energy to generate the necessary force for propulsion. This can be a challenge for long-distance missions. Additionally, the technology is still in its early stages and requires further research and development.

## 4. Can space propulsion without mass ejecting be used for interstellar travel?

While there have been some proposed concepts for using space propulsion without mass ejecting for interstellar travel, it is currently not feasible with our current technology. The energy requirements and distance involved make it a significant challenge.

## 5. How does space propulsion without mass ejecting compare to traditional rocket propulsion?

Space propulsion without mass ejecting is a relatively new concept and is still being researched and developed. While it has the potential to be more efficient and cost-effective, traditional rocket propulsion is currently the most commonly used method for space travel and has a longer track record of success.

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