Tesla Inc. (TSLA) has just given its customers another incentive to actively promote the company’s electric cars and solar products to friends and family.

In a tweet, CEO Elon Musk pledged to give Tesla owners that refer someone to make a purchase the option to have a picture of their choice launched into outer space. “Tesla owners can refer someone to buy a Tesla & get any image they want laser etched in glass & sent to deep space for millions of years,” Musk wrote on social media.

Tesla owners can refer someone to buy a Tesla & get any image they want laser etched in glass & sent to deep space for millions of years https://t.co/GIkezD5GDA

— Elon Musk (@elonmusk) October 5, 2018

The new prize will be available from Oct. 5, according to Tesla’s website, for any customer who refers someone else to buy Model S, Model X, Model 3 and solar products using their referral code. Early access to software was also introduced as another referral perk after an offer for free unlimited supercharging was withdrawn by the company last month.

The plan was to initially downgrade unlimited supercharging to a year, reported Electrek. However, the company has since opted for a $100 supercharging credit, as part of its efforts to cut costs and churn out a profit for the first time.

Under the current reward scheme, different perks are offered depending on the number of referrals made. One referral will earn customers the right to send an image into space, while two referrals offers a choice between a signature black wall connector featuring Musk’s signature or a miniature drivable electric Model S for kids.

Moving further up the scale, three referrals comes with either a new set of 21” Arachnid Wheels for the Model S or 22” Turbine Wheels for the Model X or the option to borrow a Model S or Model X for one week, while four referrals grants priority access to vehicle software updates.

At the top of the scale, those with five referrals can get their hands on a VIP invitation to a future unveiling event. Tesla is also offering $250 in cash or credit per each installed referral and the option to pass on to five friends a five-year extended limited warranty on new solar energy system installations. (See also: Tesla Directors Proposed James Murdoch as Chair: Report.)

News of the new space reward was hardly enough to lift investor spirits. Tesla shares fell 2.75% in pre-market trading after Musk mocked the Securities and Exchange Commission (SEC) just days after reaching a settlement with the regulator for tweeting about taking Tesla private at $420 per share. (See also: Musk Takes a Shot at SEC Days After Settlement.)