One Astronomer's Universe
photograph of the remnant of Supernova Cassiopeia A taken by the Einstein
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NOVA: So, in this golden age, can amateur astronomers still make contributions
Groot: Yes, absolutely. No doubt there. For one thing, when we professional
astronomers go observing, we apply for time on a telescope, and inevitably
there are too many people, so cuts have to be made. We end up being able to use
the telescope for only a very limited number of nights, say four or five, a
week perhaps, two weeks if we're very lucky. That means we can only study
stars, for instance, for that short period, and what happens after that and in
the long-term remains unknown.
Amateur astronomers have the luxury of having a telescope all to themselves,
because it's in the backyard, and they can observe whenever they want. It's
through amateur observers that we often find, for instance, new stars. People
look at a patch of sky, and all of a sudden there's a new star appearing there,
which is a star that was already there but it has suddenly become much
brighter. A lot of the work of discovering supernovae is actually done by amateur astronomers.
NOVA: It sounds like collaboration, or openness, comes naturally to
astronomers. But isn't there fierce competition as well, in which people sort
of horde their data until they get the right place to publish it, say?
Groot: It's a bit of both, I would say, but I think the openness prevails.
Astronomers in general are quite relaxed and quite open about their
observations. As an observer, often you're the only one looking at a particular
patch of sky, so it's very hard for other astronomers to steal your results.
Hoarding does happen sometimes; people do keep data to themselves. But I think
in general it's quite relaxed, and I like that.
NOVA: When somebody else presents an idea that you think is really out there,
do you ever find yourself saying, "Oh, come on?"
"Doing science is
partly coming up with wild ideas once in a while."
Groot: Oh, yeah. I mean, doing science is partly coming up with wild ideas once
in a while. Sometimes you read papers or go to a talk where somebody presents
his or her ideas, and you think, "Ah, that's just too fantastic to be true."
Your gut feeling tells you something can't be right. Maybe you don't know
exactly what it is from the start, but something in there doesn't feel right.
But you can be fooled. I've heard things that I thought, "No, that can't be
true," and later on it turned out to be true. So it works both ways.
NOVA: So as an astronomer, how do you get your brain around such mind-bending
concepts as wormholes or spacetime or even light-years?
Groot: Well, basically you have to get used to it. I don't think it is very
good to think about those things too deeply all the time, because that might
literally drive you mad. You treat it in an abstract way. For example, you
might say "This source is nine billion light-years away." But when you say
that, you're not thinking, "Okay, this is nine billion times so many miles, and
the circumference of the Earth is 26,000 miles, so it's so many circumferences
of the Earth away," because that doesn't say anything.
These numbers are so large that it's very hard to express them in human terms,
so to speak. A light-year—the distance light travels in a year—is still
something that you can understand. The time it takes light to travel from the
sun to the Earth is eight minutes. You can scale that up, and that's still
doable up to a year. But then to go to a billion years, that becomes
One can perhaps imagine the distance light travels in a year, but to scale
that up to a billion years, says Groot, "that becomes hard."
NOVA: So what makes a good astronomer?
Groot: Keeping an open mind, and being on the lookout for things that you don't
expect. For instance, say you're analyzing data that comes in from observations
you're doing, and you see something strange, something out of the ordinary. You
should have the openness of mind to say, "Hey, that's interesting, that doesn't
fit into the picture. What's going on?" Then you can go after it and adjust
your ideas about how stars work or how galaxies work, because there's some new
That's not just for astronomers; that's for all scientists. But in astronomy it
happens a lot, because we can't predict the universe. We can't predict what's
going to happen tomorrow.
NOVA: Do you have to be a techno-wizard?
"Many astronomers have no idea how
telescopes actually work."
Groot: Absolutely not. I know many astronomers who are not techno-wizards. Even
among astronomers who use telescopes, many have no idea how telescopes actually
work. They know how to get the observations they want, but if the telescope
breaks and you ask them to fix it, they have no clue where to begin.
NOVA: What about math? Do you have to have an affinity for it?
Groot: Well, yeah. They always say math is the language of physics (and
astronomy is part of physics—it's astrophysics). So you should have a
certain affinity for math, but you don't have to be a superstar. I myself am
not a superstar in math. I mean, the lowest grade I had in my high-school exams
was in math.
NOVA: Do you have a single piece of advice that you'd put at the top of a list
for budding astronomers?
Astronomers-in-the-making should follow their interests, Groot advises, not the latest
trends or fashions.
Groot: Go after the things that you like, that you think are fun. If you want
to be an astronomer or any kind of scientist, the reason why you do it should
be because it's fun and you like it. You should always try to follow that path.
If you like stars, go and study stars; if you like galaxies, go and study
galaxies. If you like to do theory, go and do theory. I think that's far more
important than following trends or fashions in astronomy or in physics or in
any research. That and having an inquisitive mind, wanting to know how things
NOVA: I've heard, though, that in astronomy graduate school is hell, the
competition for the few jobs out there is mercenary, and once you get a job
you're poorly paid, you're at the mercy of your equipment, and you must publish
or perish. You spend a lot of time traveling to remote mountaintops, where you
stay all night for days on end—that is, if bad weather doesn't delay your
project for months. Does this jibe with your experience, and, if so, why would
anybody willingly become an astronomer?
Groot: Well, it's all true! The reason I still want to be an astronomer is
because I think it's fun. Somewhere deep inside I have this urge to know what's
out there and how it works and what our place in the universe is and how the
universe started and how it will end—all these questions. As long as you
like what you're doing, it outweighs all the other things you just mentioned.
"Somewhere deep inside I
have this urge to know what's out there."
The thing I like about astronomy over, say, physics is the fact that you can't
choose what's going to happen next. If you work in a physics lab, you can
adjust the temperature or the pressure or whatever quantity you're trying to
measure. But in astronomy you can't do that. You're at the mercy of what comes
from the universe towards us.
So you need to sit on that lonely mountaintop in the middle of nowhere—which, I have to say, can be in a very nice place as well. I mean, Hawaii's not
the worst place to go; the Canary Islands are not the worst place to go. It's
not all gloom and darkness out there. But something completely unexpected may
happen right at the moment when you're observing, and that makes it exciting.
It's the thrill of making new discoveries.
I'm an observer myself, so I often go to those mountaintops and sit there from
night to night. And one of the nicest things is when the data come in and you
get your first chance to shed light on what you've recorded. You say, "Okay,
what's in there? Is it what I expect, or is it different?" That stays exciting
no matter how often you go to a telescope to observe.
One of the joys of observing, Groot says, is that something
utterly unexpected could occur at the very moment you're using the
NOVA: When you're not on a mountaintop, what's your average day like?
Groot: It sounds very boring, but I have to go into the office and work from
nine to five. I have to reduce the data that I've collected from the telescope.
That is, I get something I can use from the raw format that came from the
telescope. Then I analyze that data. It's a lot of computer work, because
nowadays all major telescopes are equipped with electronic devices like video
cameras that capture the images or the spectra or whatever you get from the
telescope. It's all stored on hard disks and little tapes that you take with
After you do the reduction and analysis and hopefully find something, you write
a paper to be published in a scientific journal. As part of that you have to go
through the literature, and you have to talk a lot with colleagues about
strange things that might happen and things you don't understand. It's very
much like being in an office.
NOVA: And must you publish or perish?
"If you write 100 papers a year but
they're all crap, you won't make it."
Groot: Yes and no. It's very important to publish, which is an inherent problem
in science nowadays, because sometimes it does feel like publish or perish. But
the quality of the papers is also very important. If you write 100 papers a
year but they're all crap, you won't make it. If you write only three or five
papers a year, but they're of very good quality and high impact, then you will.
Luckily, quality still wins out.
NOVA: So what's the difference between astronomers and astrophysicists, and do
they get along?
Groot: There's basically no difference between the two. Astronomy is the
old term, which literally means naming the stars, and astrophysics is
trying to understand the physics of the stars. Nowadays, they're the same, so
yes, I think astronomers and astrophysicists get along very well, because
they're the same people. And I generally get along very well with
NOVA: Can you sum up the life of an astronomer in five words or less?
Groot: "Fun." That's less than five words, I think! "International" would be a
very good one as well, because astronomy's a very international science, so you
have a lot of contact with people abroad, and you travel a lot. "Beautiful," in
that the observatories I go to are often in very remote places, and I always
find those places beautiful, even though they're usually in the middle of the
desert, and it's completely dry, and nothing grows there.
NOVA: You have two words left.
Recorded by the Hubble Space Telescope on March 1,
2000, this image shows the optical counterpart of a gamma-ray burst that
occurred on the far side of the visible universe.
Groot: "Opportunity," I would say. Opportunities arise very quickly in
astronomy, because things can happen all of a sudden, like the work I did with
gamma-ray bursts. One week I was doing my own science, which is not really in
the limelight, and the next week I discovered, with Titus Galama, the first
optical counterpart of a gamma-ray burst. The whole astronomy world fell over
us, because that's what they've been aiming for for 30 years. It is still one of
the hottest topics in astronomy even now, five years later.
That's four. The fifth one.... Well, "fun" again, if that's allowed, to put fun
Interview conducted by Peter Tyson, editor in chief of NOVA Online
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