NASA's newest space telescope is ready for its moment on stage  —  and soon, in space.

The agency will unveil the Nancy Grace Roman Space Telescope on Tuesday (April 21) at 4 p.m. EDT (2100 GMT), and you can watch the event live here at Space.com courtesy of NASA.

Read more for details on what to expect at the news conference, as well as what's next for the mission launching as soon as this fall.

News conference and launch

According to NASA, briefing participants, who will discuss the telescope's progress and science plans, include:

• NASA Administrator Jared Isaacman
• Nicky Fox, associate administrator, science mission directorate
• Jamie Dunn, Roman telescope project manager
• Julie McEnery, Roman telescope senior project scientist.

The news conference will take place at NASA's Goddard Spaceflight Center in Greenbelt, Maryland, where Roman was built.

Roman is almost finished its prelaunch testing at Goddard ahead of its last big journey on Earth — a shipment to NASA's Kennedy Space Center in Florida, where the telescope will launch aboard SpaceX Falcon Heavy between autumn 2026 and May 2027.

What is Roman?

Roman, estimated to cost more than $4 billion, is a big survey telescope designed to show astronomers more about how the universe formed and evolved.

Roman has a telescope mirror similar in size to the famed Hubble Space Telescope, at 8 feet or 2.4 meters. But the key difference is scope: Hubble narrows in on fine details, while Roman aims to survey the sky with a field of view 100 times larger than Hubble's.

Looking at large-scale structure of galaxies and stars is part of Roman's work, as it seeks to answer questions about how the universe formed, evolved and expanded with investigations concerning dark matter and dark energy.

Searching for exoplanets

Roman will also do a "Galactic Bulge Time-Domain Survey" to look at the central bulge of stars of the Milky Way galaxy. Investigators will mostly be looking for exoplanets, using a technique called gravitational lensing.

Very simply put, bent starlight from distant galaxies can allow objects passing in front of massive objects to be temporarily magnified and visible, thanks to how general relativity and space-time works.

This will allow Roman to hunt down exoplanets through flickers, or distortions, in starlight as planets pass in front of stars — assuming the distortions aren't due to starquakes, or some other stellar phenomena.