After 60 years of space activity - Questions

1. Underline all the numbers in the text and say what they correspond to:

• the total weight (mass) of all rockets, satellites, debris in space,
• the number of times rockets have been sent (launched) into space,
• the number of objects still floating in space,
• the total number of objects sent in orbit, monitored by satellites,
• the number of working (operational) satellites in space,
• the time period of space activities.

2. What is the US Space Surveillance Network's mission?