CAPE CANAVERAL, Fla. 鈥 Just over a day after blasting off, a SpaceX crew capsule arrived at the International Space Station on Sunday, delivering the replacements for NASA鈥檚 two stuck astronauts.

Astronauts Don Pettit, bottom center, hugs Kirill Peskov as astronauts greet each other after a SpaceX capsule docked Sunday at the International Space Station.
The four newcomers 鈥 representing the U.S., Japan and Russia 鈥 will spend the next few days learning the station鈥檚 ins and outs from Butch Wilmore and Suni Williams. Then the two will strap into their own SpaceX capsule later this week, one that has been up there since last year, to close out an unexpected extended mission that began last June.
Wilmore and Williams expected to be gone just a week when they launched on Boeing鈥檚 first astronaut flight. They hit the nine-month mark earlier this month.
The Boeing Starliner capsule encountered so many problems that NASA insisted it come back empty, leaving its test pilots behind to wait for a SpaceX lift.
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Wilmore swung open the space station's hatch and then rang the ship's bell as the new arrivals floated in one by one and were greeted with hugs and handshakes.
鈥淚t was a wonderful day. Great to see our friends arrive,鈥 Williams told Mission Control.

This image made from video shows astronauts greeting each other after a SpaceX capsule docked Sunday at the International Space Station. Top row from left: Nick Hague, Alexander Gorbunov, Suni Williams, Alexei Ovchinin and Ivan Vagner. Bottom row from left: Butch Wilmore, Takuya Onishi, Anne McClain, Kirill Peskov, Nichole Ayers and Don Pettit.聽
Wilmore's and Williams' ride arrived back in late September with a downsized crew of two and two empty seats reserved for the leg back. But more delays resulted when their replacements鈥 brand new capsule needed extensive battery repairs. An older capsule took its place, pushing up their return by a couple weeks to mid-March.
Weather permitting, the SpaceX capsule carrying Wilmore, Williams and two other astronauts will undock from the space station early Tuesday and splash down off Florida's coast later that evening.
Until then, there will be 11 aboard the orbiting lab, representing the U.S., Russia and Japan.
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A SpaceX Falcon 9 rocket, with a crew of two astronauts, lifts off from launch pad 40 at the Cape Canaveral Space Force Station in Cape Canaveral, Fla., Saturday, Sept. 28, 2024. (AP Photo/Chris O'Meara)

A SpaceX Falcon 9 rocket, with a crew of two astronauts, lifts off from launch pad 40 at the Cape Canaveral Space Force Station Saturday, Sept. 28, 2024, in Cape Canaveral, Fla. (AP Photo/Chris O'Meara)

NASA astronaut Nick Hague, left, and Roscosmos cosmonaut Aleksandr Gorbunov, left, gives a thumbs up as they leave the Operations and Checkout Building on their way to Launch Complex 40 for a mission to the International Space Station Saturday, Sept. 28, 2024 at Cape Canaveral, Fla., (AP Photo/John Raoux)

NASA astronaut Nick Hague, right, and Roscosmos cosmonaut Aleksandr Gorbunov leave the Operations and Checkout building for a trip to the launch pad 40 Saturday, Sept. 28, 2024, at the Kennedy Space Center in Cape Canaveral, Fla. (AP Photo/Chris O'Meara)

NASA astronaut Nick Hague, right, talks to his family members as Roscosmos cosmonaut Aleksandr Gorbunov looks on after leaving the Operations and Checkout building for a trip to the launch pad 40 Saturday, Sept. 28, 2024, at the Kennedy Space Center in Cape Canaveral, Fla. Two astronauts are beginning a mission to the International Space Station. (AP Photo/Chris O'Meara)

In this image from video provided by NASA, Roscosmos cosmonaut Aleksandr Gorbunov, left, and astronaut Nick Hague travel inside a SpaceX capsule en route to the International Space Station after launching from the Kennedy Space Center in Cape Canaveral, Fla., Saturday, Sept. 28, 2024. (NASA via AP)

A SpaceX Falcon 9 rocket, with a crew of two astronauts, lifts off from launch pad 40 at the Cape Canaveral Space Force Station Saturday, Sept. 28, 2024, in Cape Canaveral, Fla. (AP Photo/Chris O'Meara)

A SpaceX Falcon 9 rocket, with a crew of two astronauts, lifts off from launch pad 40 at the Cape Canaveral Space Force Station in Cape Canaveral, Fla., Saturday, Sept. 28, 2024. (AP Photo/Chris O'Meara)

A SpaceX Falcon 9 rocket with a crew of two lifts off from launch pad 40 at the Cape Canaveral Space Force Station Saturday, Sept. 28, 2024 at Cape Canaveral, Fla. (AP Photo/John Raoux)

The Falcon 9's first stage booster returns to Landing Zone 1 at the Cape Canaveral Space Force Station Saturday, Sept. 28, 2024 at Cape Canaveral, Fla. (AP Photo/John Raoux)

A SpaceX Falcon 9 rocket with a crew of two lifts off from launch pad 40 at the Cape Canaveral Space Force Station Saturday, Sept. 28, 2024 at Cape Canaveral, Fla. (AP Photo/John Raoux)