The most important recent scientific discoveries about space have been made by the

They were made by NASA.

Explanation:

NASA is a US federal agency that has a large team of scientists and researchers responsible for the development of new technologies and for the most recent and most relevant scientific discoveries.

In February, for example, NASA discovered, through space probes, that solar winds appear differently in regions close to the sun. Here on earth, these winds are very active, directly interfering with the planet's magnetic field and interfering with the functioning of various electronic devices.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.