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A massive 19 million pounds (8.6 million kilograms) of Space Shuttle, support and transport hardware, inch toward Launch Pad 39A from the Vehicle Assembly Building. The fully assembled Space Shuttle Endeavour, minus its payloads, weighs about 4.5 million pounds (2 million kg.); the mobile launch platform on which it was stacked and from which it will lift off weighs 9.25 million pounds (4.19 million kg.) and the crawler-transporter carrying the platform and Shuttle checks in at around 6 million pounds (2.7 million kg.). Once at the pad, the Shuttle and launch platform will be positioned atop support columns to complete preparations for the second Shuttle launch of 1995. Primary payload of Mission STS-67 is the Astro-2 astrophysics observatory, carrying three ultraviolet telescopes that flew on the Astro-1 mission in 1990. STS-67 also is scheduled to become the longest Shuttle flight to date, lasting 16 days.