Astronomers typically deal with the very, very large – big telescopes, giant galaxies, and massive exploding stars.
But one of the more revolutionary astronomy tools of the
decade is a mini satellite about the size of a breadbox.
The satellite will act like an artificial star for
astronomers to observe from the ground, allowing them to more accurately
measure a space object's brightness and better understand some of the biggest
mysteries in our universe, like dark energy.
NASA recently approved the US$19.5 million Landolt Space
Mission to launch the mini satellite into Earth's orbit.
"This is some really awesome science that NASA is
supporting," Tyler Richey-Yowell, a postdoctoral researcher at Lowell
Observatory who studies stellar astronomy and exoplanets, told Business
Insider. "It's something that's going to help out all astronomers."
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Landolt, which is about the size of a bread box, is designed
to fire lasers at observatories on Earth to help astronomers study the stars.
(Eliad Peretz/NASA) |
A revolutionary new tool for Astronomers
The mini-satellite, called CubeSat, is designed to orbit
Earth from 22,236 miles away. At that distance, its speed will match Earth's
spin so the satellite will appear fixed in the night sky and will be an easy
target for telescopes to track.
You won't be able to see it with the naked eye. But to
telescopes, it'll look like a star. The mission is scheduled to launch in 2029.
It will be the first tool of its kind.
"This is really new for us to have some sort of
artificial star quote unquote up there that we can go and rely on and
use," Richey-Yowell told BI.
What makes this "artificial star" better than a
real one is that astronomers will know exactly how much light it's emitting.
The CubeSat, named Landolt for the late astronomer Arlo
Landolt, will fire lasers with a specific number of light particles, or
photons, which astronomers can use to calibrate their telescopes for measuring
light.
This can help eliminate a lot of the guesswork that
astronomers do now when using real stars to calibrate their instruments.
The problem is that there's no way of knowing exactly how
much light real stars emit because we can't send a probe to one to accurately
measure its brightness, Richey-Yowell said. Moreover, Earth's atmosphere
absorbs a lot of light from space, which can also affect astronomers'
calibrations.
"That's why this Landolt mission is so important,"
Richey-Yowell said. "If we send up a mission like this one where we know
exactly how many photons, how much light per second, is coming from this
CubeSat," then we can use it to compare and more precisely measure the
light from other objects, like real stars, she said.
The mission is expected to help astronomers measure the
light emitted from stars with 10 times more accuracy than current estimates,
LiveScience reported.
It's like if you were given a 1,000-piece puzzle that only
had half the amount of pieces, and then someone gifted you a few hundred more
pieces. Landolt will help astronomers catch minute details they've otherwise
been missing in the data.
How Landolt could revolutionize Astronomy
"All of our astronomy is based on light, and so we
really need to know how much light we are actually receiving,"
Richey-Yowell said.
You can learn a lot from a ray of light: a star's
temperature, its mass, the types of exoplanets orbiting it, and whether they
could potentially harbor life.
For example, knowing how hot a host star is can tell you how
far an exoplanet must be in order to sustain liquid water on its surface,
Richey-Yowell said. Water is one of the main ingredients for life as we know
it, and one of the key features astrobiologists search for when scoping out
potential planets that could harbor life.
Finding more Earth-like planets is just the beginning.
Astronomers can also use Landolt to measure light from distant exploding stars,
called supernovae, that help calculate the expansion rate of the universe.
Right now, cosmologists studying the universe's expansion
face a huge challenge: they can't settle on a single value for the expansion
rate. Some methods lead to one value while others lead to a slightly different
one. This conundrum could be key to figuring out some of the biggest mysteries
of the universe, like understanding the invisible force ripping our universe
apart that we call dark energy.
"So really anything from small, tiny planets to the
whole scale of the universe relies on our understanding of stars and how bright
they are and what kind of light they're emitting," Richey-Yowell said.
"I really do think it will be revolutionary for astronomy."