Axios

The space above Earth is becoming increasingly crowded with satellites and junk, and space companies are coming together to update and establish new rules of the cosmic road in orbit.

Why it matters: Thousands of satellites are active in orbit today. All that traffic in orbit means that satellites — speeding at more than 17,000 mph — can have close calls with one another, forcing operators to expend precious fuel to maneuver away and keep their expensive spacecraft safe.

The Environmental Protection Agency is expected to propose new rules limiting auto tailpipe emissions this week as part of a plan to accelerate a transition to electric vehicles in the U.S.

Why it matters: Transportation is the country's largest source of greenhouse gas emissions.