space-time articles - Page: 3

What is the barrier between Earth and space called?

The boundary separating our terrestrial atmosphere from the vastness of space is not marked by a sudden wall or a dramat...

How many times has Soyuz failed?

The Soyuz rocket family represents one of the longest-serving and most active launch systems in the history of spaceflig...

Do rockets use fuel in space?

The simple answer to whether rockets still need fuel once they are already in the vast emptiness of space is an emphatic...

Is China's space program better than the US?

The comparison between the space programs of the United States and China has shifted from a distant gap to a near-term c...