Propellant

Scientists at the Universidad Carlos III de Madrid (UC3M) and the Universidad Politécnica de Madrid have come up with a propellantless propulsion system that also doubles as an electric generator by using the Earth's magnetic field interacting with a 2-km long aluminum tether.

Firefly Space Systems recently unveiled its planned Alpha launcher aimed at the small satellite launch market. It is designed to launch satellites into low-Earth orbit at very low cost with an unconventional aerospike engine. It is also the first orbital launcher to use methane as fuel.

Moon Express has revealed the design of its MX-1 entry for the Google Lunar X Prize competition. Not a one-trick pony, the MX-1 is intended as the first of a series of robotic spacecraft that can carry out a multitude of tasks in Earth orbit as well as in deep space.

Elon Musk, founder and CEO of SpaceX, says that the missions to Mars by his company will use rockets powered by methane.

NASA has put out the call for greener propellant fuel to replace hydrazine on the spacecraft of the future

The ANYWAY Spray is a tube that allows people to use spray bottles at any angle, right down to the last drop.