It was a big year for Elon Musk.
The Tesla and SpaceX CEO began the year by hitting a target, ended it by missing another one--and a lot happened in between.
As the year comes to a close, here are some of the entrepreneur's biggest moments from 2017.
January 4: Tesla starts the year off on the right foot by hitting a goal. The company reveals in a blog post that it's begun mass-producing batteries at its massive Gigafactory, a goal it had previously said it hoped to hit in early 2017. The lithium ion cells are for use in its Powerpack and Powerwall home batteries.
January 23: Musk meets with President Trump at the White House. It's the first meeting of the economic advisory council that also includes Michael Dell and Under Armour founder Kevin Plank.
February 1: Several months after the company voted to buy SolarCity, an SEC filing reveals that Tesla Motors is officially changing its name to simply Tesla, signaling the company's expansion beyond vehicles.
February 27: Musk announces that SpaceX plans to fly two private citizens around the moon sometime in 2018.
April 4: Tesla's stock surges above 300, giving the company a market capitalization of nearly $51 million. The firm becomes the most valuable carmaker in the U.S., surpassing Ford and GM.
April 10: Tesla unveils a new line of solar panels that are less bulky than standard panels and don't have any visible mounting hardware.
April 28: Musk reveals in a TED Talk that he has officially launched the Boring Company, which he says will dig underground tunnels for transportation. He presents the possibilities of using the tunnels in conjunction with another one of his transportation ideas--the high-speed hyperloop rail.
May 3: In its first full quarter after merging with SolarCity, Tesla posts $2.7 billion in revenue in Q1 2017, more than double that of the same period a year before. It delivers 25,000 vehicles in the quarter, a record for the company.
May 18: A report in The Guardian details the difficult work conditions at Tesla's Fremont, California, factory, revealing that hundreds of Tesla employees have been sent to the hospital in the past several years for a variety of injuries and maladies. Musk later emails the entire staff saying all injuries should be reported directly to him going forward.
June 1: After Trump announces he is pulling the U.S. out of the Paris accord--a pact that currently includes every other country in the world in a joint effort to combat climate change--Musk quits Trump's advisory council.
June 15: A paper written by Musk and published in the journal New Space outlines the entrepreneur's plan for colonizing Mars. Select details: He intends for the spaceships that carry 100 passengers at a time to include movie theaters, and he wants the Red Planet to be equipped with pizza parlors.
June 16: Tesla reveals that it has begun manufacturing batteries for its upcoming Model 3 at the Gigafactory.
June 28: Musk reveals on Twitter that he has begun digging a tunnel under Los Angeles using the Boring Company's own boring machine.
July 9: The first Model 3 rolls off Tesla's assembly line. The proud owner? Musk.
July 20: Musk causes some confusion when he tweets that he has received "verbal government approval" to build hyperloop tunnels connecting New York, Philadelphia, Baltimore, and Washington, D.C. City and state officials in those locations report that they don't have knowledge of the project. He soon backtracks, tweeting that there's "still a lot of work needed."
August 2: Tesla begins installations of its solar roofs, which act like solar panels but look like regular roofs.
August 4: Bloomberg reports that Musk has decided to pursue building the hyperloop himself, a reversal from his vow not to when he first outlined the technology in 2013.
September 29: Musk provides an update to his Mars plans at the International Astronautical Congress in Australia. He reveals that he intends to land two spacecraft on the planet by 2022 and wants to use SpaceX's rocket system one day for high-speed travel around the world.
October 2: Several months after Musk says he wants Tesla to manufacture 1,500 Model 3's in September alone, the CEO reveals that the company produced just 260 of the cars in the third quarter.
November 16: Tesla unveils the Semi, a battery-powered tractor-trailer that can travel 500 miles on a single charge. Musk says production will begin in 2019.
November 27: SpaceX confirms that it won't launch the Falcon Heavy, its new 27-engine rocket, by the end of the year like it initially intended. The company says it's targeting an early 2018 launch.