This artist's concept from August 2015 depicts NASA's InSight Mars lander fully deployed for studying the deep interior of the Red Planet. The lander is scheduled to launch in the spring of 2018.

A mission to study the inner workings of Mars is now set to launch in the spring of 2018, NASA announced today (Sept. 2).

The Interior Exploration using Seismic Investigations, Geodesy and Heat Transport, or InSight, was originally scheduled to launch in March 2016, but NASA delayed the launch indefinitely due to a serious structural problem with one of the probe's two science instruments.

Now, scientists with NASA's Jet Propulsion Laboratory have been tasked with fixing the problem before the 2018 launch date. The instrument redesign and delayed launch date will add $153.8 million to the initial $675 million budget, NASA officials said in a statement. [What's Inside Mars? NASA's InSight Mission Will Probe Deep | Video]

The probe must be launched during a particular window, when the Earth and Mars are positioned in such a way that the probe can easily reach the Red Planet. That window will open on March 5, 2018, according to the statement. The probe is now scheduled to land on Mars on Nov. 26, 2018.

The InSight mission's central aim is to understand how Mars and other rocky planets formed. The probe will land on the Red Planet surface and stay there for a full Mars year (687 Earth days). Two instruments on board InSight will study the planet's internal geologic activity, as well as the internal temperature of Mars.

By studying the planet's interior, scientists will gather clues about the planet's history, including how it formed, the statement said. Zooming out, this information can be fed into an understanding of how the other rocky planets in the solar system formed and how rocky planets might form around other stars.

The delay in launch was caused by a problem with one of the probe's instruments, the Seismic Experiment for Interior Structure (SEIS), which will measure very small seismic activity on Mars. The instrument "requires a perfect vacuum seal around its three main sensors in order to withstand harsh conditions on the Red Planet," according to the statement, but inspections done ahead of the initial launch date found leaks in the vacuum chamber.

The SEIS instrument was initially provided by the French Space Agency (CNES), with the participation of the Institut de Physique du Globe de Paris (IPGP), the Swiss Federal Institute of Technology (ETH), the Max Planck Institute for Solar System Research (MPS), Imperial College and the Jet Propulsion Laboratory (JPL), according to NASA's website.

Under the new plan, JPL scientists will be responsible for "redesigning, developing and qualifying" the portions of the instrument that failed. CNES will "focus on developing and delivering the key sensors for SEIS, integration of the sensors into the container, and the final integration of the instrument onto the spacecraft."

"We've concluded that a replanned InSight mission for launch in 2018 is the best approach to fulfill these long-sought, high-priority science objectives," Jim Green, director of NASA's Planetary Science Division, said in the statement.

While the budget increase will not affect any current missions, NASA officials said there "may be fewer opportunities for new missions in future years, from fiscal years 2017-2020."

"It's gratifying that we are moving forward with this important mission to help us better understand the origins of Mars and all the rocky planets, including Earth," Geoff Yoder, acting associate administrator for NASA's Science Mission Directorate, said in the statement.

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