With SpaceX shares soaring 20 percent on their first day of trading, the world’s richest person crossed another milestone — one with 13 digits.

© Adrees Latif/Reuters

Two Times tech reporters and their editor talk about assessing the sky-high valuation of the rocket and satellite maker, the potential economic impact of its public debut and the role of the world’s richest man in it all.

© Eric Gay/Associated Press

Investors who bought the automaker’s shares in its initial public offering became rich. As a result, many have a deep faith in Elon Musk, the chief executive of Tesla and SpaceX.

© Brendan McDermid/Reuters

Building on the country’s electric vehicle industry, Chinese companies are making robot parts at a scale and price point others can’t match.

© Qilai Shen for The New York Times

The Iran war is pushing countries to prioritize domestic energy in order to protect themselves from volatile oil and natural gas markets.

© Jes Aznar for The New York Times