Question: How is the Sun’s gravity strong enough to hold distant planets like Jupiter and Saturn in orbit, but not strong enough to have already swallowed Mercury? Answer: To understand this, first, ...

[Update: My apologies: due to a cut-and-paste error, I had mistakenly listed the perihelion distance as the average distance of the Earth to the Sun (147 versus 149 ...

An overhead view of SpaceX's Starship on the launch pad ahead of its planned orbital test flight. SpaceX is gearing up for a huge milestone: the first orbital-velocity launch of its combined Super ...

Edited to add: I have taken the topic of this post and logically continued it in a post about Pluto. Every now and again I get an email from someone who tries to tell me that the moon orbits the Sun ...

Epic orbital flight, and then landing, will prove its real worth Highlights Maiden flight of next-generation 5,000-tonne “Starship”, the most powerful rocket so far on Earth, is due later this month — ...

CHANDLER, Ariz.--(BUSINESS WIRE)--Using its Modular Architecture Propulsion System (MAPS™) technology, PacSci EMC successfully fired a series of solid rocket motors to both point and significantly ...