Skip to main content
  1. Home
  2. Space
  3. News

NASA’s latest bright idea? Using harpoons to ‘hitchhike’ on comets and asteroids

By

nasa comet hitchhiking hitchhike main
NASA/JPL-Caltech/Cornelius Dammrich
Landing a spacecraft on a comet or asteroid is a challenging task. These celestial objects not only move at astronomical speed; they also have relatively low gravitational pull, which makes it difficult to land on them. A spacecraft has to expend a lot of energy while trying to match the speed of a comet or asteroid so it can land on it. A recent proposal by Masahiro Ono of NASA’s Jet Propulsion Laboratory, Pasadena, California may have solved this conundrum by applying the principle of hitchhiking. Instead of racing to catch up with a comet, a spacecraft would bum a ride off the comet before it attempts to land on it.

Instead of using costly fuel to accelerate a spacecraft toward a comet or an asteroid, Ono’s proposed system would use a reusable tether system that would capture the comet. While approaching a comet, the spacecraft would release an extendable tether with a harpoon that would attach the craft to the object. The spacecraft then would reel out the tether much like a fisherman slackens and tightens his line when he catches a fish. As the craft begins to accelerate from the force of the moving comet, the spacecraft then can apply a brake and harvest the kinetic energy generated from this resistance.

Recommended Videos

Ono and his team have calculated what they call the “Space Hitchhike Equation,” a mathematical formula that describes the tether strength, mass of the spacecraft and other variables involved in the hitchhiking process. According to their calculations, the space-based rope would need to be anywhere from 62 to 620 miles long and must be made from a material capable of withstanding extreme tension and heat. Currently, Zylon and Kevlar are the only two materials capable of withstanding one of the slowest comet accelerations of 0.9 miles per second. A faster 6.2 mile-per-second propulsion would require advanced materials such as a carbon nanotube tether paired with a diamond harpoon.

Once the spacecraft is matching the speed of the comet or asteroid, the ship then can start to reel in its tether and inch closer to the asteroid until it is has made a gentle landing. It can stay attached and travel along with the comet as long as needed. When it is time to travel to another object, the craft can use its stored energy to release the tether and propel itself towards its next target.

Editors' Recommendations

Topics
Kelly Hodgkins
Kelly Hodgkins
Contributor
Kelly's been writing online for ten years, working at Gizmodo, TUAW, and BGR among others. Living near the White Mountains of…
Junk from the ISS fell on a house in the U.S., NASA confirms
The International Space Station.

A regular stanchion (left) and the one recovered from the NASA flight support equipment used to mount International Space Station batteries on a cargo pallet. The recovered stanchion survived reentry through Earth’s atmosphere on March 8, 2024, and impacted a home in Florida. NASA

When Alejandro Otero’s son called him on March 8 to say that something had crashed through the roof of their home, he initially thought it might have been a meteorite.

Read more
These 3 companies are developing NASA’s new moon vehicle
An artist’s concept design of NASA’s Lunar Terrain Vehicle.

NASA has big plans for the moon -- not only sending people back to the moon for the first time in over 50 years but also having them investigate the exciting south pole region, where water is thought to be available. The plan is not just for astronauts to visit for a day or two, but to have them stay on the moon for weeks at a time, exploring the surrounding area. And to explore, they can't just travel on foot -- they'll need a new moon buggy.

Today, Wednesday, April 3, NASA announced the three companies developing its new lunar vehicle: Intuitive Machines, Lunar Outpost, and Venturi Astrolab. They'll each develop a lunar terrain vehicle (LTV) that can carry astronauts from their landing site across the moon's surface, allowing them to range further and reach more areas of interest.

Read more
NASA astronauts will try to grow plants on the moon
An artist’s concept of an Artemis astronaut deploying an instrument on the lunar surface.

An artist’s concept of an Artemis astronaut deploying an instrument on the lunar surface. NASA

It was almost a decade ago when astronauts aboard the International Space Station sat down for a meal of historical significance as it was the first to include food -- albeit only lettuce -- grown and harvested in space.

Read more