Education
All the Contents of the Universe, in One Graphic
All the Contents of the Universe, in One Graphic
Scientists agree that the universe consists of three distinct parts: everyday visible (or measurable) matter, and two theoretical components called dark matter and dark energy.
These last two are theoretical because they have yet to be directly measured—but even without a full understanding of these mysterious pieces to the puzzle, scientists can infer that the universe’s composition can be broken down as follows:
Component | Value | ||||
---|---|---|---|---|---|
Dark energy | 68% | ||||
Dark matter | 27% | ||||
Free hydrogen and helium | 4% | ||||
Stars | 0.5% | ||||
Neutrinos | 0.3% | ||||
Heavy elements | 0.03% |
Let’s look at each component in more detail.
Dark Energy
Dark energy is the theoretical substance that counteracts gravity and causes the rapid expansion of the universe. It is the largest part of the universe’s composition, permeating every corner of the cosmos and dictating how it behaves and how it will eventually end.
Dark Matter
Dark matter, on the other hand, has a restrictive force that works closely alongside gravity. It is a sort of “cosmic cement” responsible for holding the universe together. Despite avoiding direct measurement and remaining a mystery, scientists believe it makes up the second largest component of the universe.
Free Hydrogen and Helium
Free hydrogen and helium are elements that are free-floating in space. Despite being the lightest and most abundant elements in the universe, they make up roughly 4% of its total composition.
Stars, Neutrinos, and Heavy Elements
All other hydrogen and helium particles that are not free-floating in space exist in stars.
Stars are one of the most populous things we can see when we look up at the night sky, but they make up less than one percent—roughly 0.5%—of the cosmos.
Neutrinos are subatomic particles that are similar to electrons, but they are nearly weightless and carry no electrical charge. Although they erupt out of every nuclear reaction, they account for roughly 0.3% of the universe.
Heavy elements are all other elements aside from hydrogen and helium.
Elements form in a process called nucleosynthesis, which takes places within stars throughout their lifetimes and during their explosive deaths. Almost everything we see in our material universe is made up of these heavy elements, yet they make up the smallest portion of the universe: a measly 0.03%.
How Do We Measure the Universe?
In 2009, the European Space Agency (ESA) launched a space observatory called Planck to study the properties of the universe as a whole.
Its main task was to measure the afterglow of the explosive Big Bang that originated the universe 13.8 billion years ago. This afterglow is a special type of radiation called cosmic microwave background radiation (CMBR).
Temperature can tell scientists much about what exists in outer space. When investigating the “microwave sky”, researchers look for fluctuations (called anisotropy) in the temperature of CMBR. Instruments like Planck help reveal the extent of irregularities in CMBR’s temperature, and inform us of different components that make up the universe.
You can see below how the clarity of CMBR changes over time with multiple space missions and more sophisticated instrumentation.
What Else is Out There?
Scientists are still working to understand the properties that make up dark energy and dark matter.
NASA is currently planning a 2027 launch of the Nancy Grace Roman Space Telescope, an infrared telescope that will hopefully help us in measuring the effects of dark energy and dark matter for the first time.
As for what’s beyond the universe? Scientists aren’t sure.
There are hypotheses that there may be a larger “super universe” that contains us, or we may be a part of one “island” universe set apart from other island multiverses. Unfortunately we aren’t able to measure anything that far yet. Unravelling the mysteries of the deep cosmos, at least for now, remains a local endeavor.
United States
Ranked: America’s Best Universities
Evaluated on 19 different metrics, here’s the list of America’s best universities, led by 14 private schools.

Ranked: America’s Best Universities
The latest ranking of America’s best universities is here, perfectly timed for the approaching admissions season.
“Best” is of course subjective, and U.S. News and World Report has compiled 19 metrics on which they evaluated more than 400 national universities. Some of them include:
- Graduation rates & performance: A four-year rolling average of the proportion of each entering class earning a bachelor’s degree in six years or less. Performance is measured against predictions made by the publishers, and when beaten, the university gains a higher scoring.
- Peer assessment: A two-year weighted average of ratings from top academics—presidents, provosts and deans of admissions—on academic quality of peer institutions with which they are familiar.
- Financial resources: The average per student spend on instruction, research, student services and related educational expenditures in the 2021 fiscal year.
- Debt: A school’s average accumulated federal loan debt among borrowers only.
- Pell graduation rates & performance: the same calculation as stated above, but focused only on Pell Grant students, adjusted to give more credit to schools with larger Pell student proportions.
The website’s methodology section details how they sourced their data, the weights assigned to each metric, and their changes over the years.
From the hundreds assessed come the nearly 50 best universities that offer a variety of undergraduate majors, post-graduate programs, emphasize research, or award professional practice doctorates.
Which are the Best Universities in America?
At the top of the list, Princeton University is the best university in the country, known for its physics, economics, and international relations departments. Notably, it’s a rare Ivy league university that does not have a law, medical, or business school.
Here’s the full ranking of America’s best universities, along with annual tuition requirements.
Rank | School Name | State | Tuition |
---|---|---|---|
1 | Princeton University | New Jersey | $59,710 |
2 | Massachusetts Institute of Technology | Massachusetts | $60,156 |
3 | Harvard University | Massachusetts | $59,076 |
3 | Stanford University | California | $62,484 |
5 | Yale University | Connecticut | $64,700 |
6 | University of Pennsylvania | Pennsylvania | $66,104 |
7 | California Institute of Technology | California | $63,255 |
7 | Duke University | North Carolina | $66,172 |
9 | Brown University | Rhode Island | $68,230 |
9 | Johns Hopkins University | Maryland | $63,340 |
9 | Northwestern University | Illinois | $65,997 |
12 | Columbia University | New York | $65,524 |
12 | Cornell University | New York | $66,014 |
12 | University of Chicago | Illinois | $65,619 |
15 | University of California, Berkeley | California | $48,465 (out-state) $15,891 (in-state) |
15 | University of California, LA | California | $46,326 (out-state) $13,752 (in-state) |
17 | Rice University | Texas | $58,128 |
18 | Dartmouth College | New Hampshire | $65,511 |
18 | Vanderbilt University | Tennessee | $63,946 |
20 | University of Notre Dame | Indiana | $62,693 |
21 | University of Michigan, Ann Arbor | Michigan | $57,273 (out-state) $17,786 (in-state) |
22 | Georgetown University | Washington, DC | $65,082 |
22 | University of North Carolina at Chapel Hill | North Carolina | $39,338 (out-state) $8,998 (in-state) |
24 | Carnegie Mellon University | Pennsylvania | $63,829 |
24 | Emory University | Georgia | $60,774 |
24 | University of Virginia | Virginia | $58,950 (out-state) $22,323 (in-state) |
24 | Washington University, St. Louis | Missouri | $62,982 |
28 | University of California, Davis | California | $46,043 (out-state) $15,266 (in-state) |
28 | University of California, San Diego | California | $48,630 (out-state) $16,056 (in-state) |
28 | University of Florida | Florida | $28,658 (out-state) $6,381 (in-state) |
28 | University of Southern California | California | $68,237 |
32 | University of Texas, Austin | Texas | $41,070 (out-state) $11,698 (in-state) |
33 | Georgia Institute of Technology | Georgia | $32,876 (out-state) $11,764 (in-state) |
33 | University of California, Irvine | California | $47,759 (out-state) $15,185 (in-state) |
35 | New York University | New York | $60,438 |
35 | University of California, Santa Barbara | California | $45,658 (out-state) $14,881 (in-state) |
35 | University of Illinois Urbana-Champaign | Illinois | $36,068 (out-state) $17,572 (in-state) |
35 | University of Wisconsin, Madison | Wisconsin | $40,603 (out-state) $11,205 (in-state) |
39 | Boston College | Massachusetts | $67,680 |
40 | Rutgers University, New Brunswick | New Jersey | $36,001 (out-state) $17,239 (in-state) |
40 | Tufts University | Massachusetts | $67,844 |
40 | University of Washington | Washington | $41,997 (out-state) $12,643 (in-state) |
43 | Boston University | Massachusetts | $65,168 |
43 | The Ohio State University | Ohio | $36,722 (out-state) $12,485 (in-state) |
43 | Purdue University, Main Campus | Indiana | $28,794 (out-state) $9,992 (in-state) |
46 | University of Maryland, College Park | Maryland | $40,306 (out-state) $11,505 (in-state) |
47 | Lehigh University | Pennsylvania | $62,180 |
47 | Texas A&M University | Texas | $40,607 (out-state) $12,413 (in-state) |
47 | University of Georgia | Georgia | $30,220 (out-state) $11,180 (in-state) |
47 | University of Rochester | New York | $64,384 |
47 | Virginia Tech | Virginia | $36,090 (out-state) $15,478 (in-state) |
47 | Wake Forest University | North Carolina | $64,758 |
53 | Case Western Reserve University | Ohio | $62,234 |
53 | Florida State University | Florida | $21,683 (out-state) $6,517 (in-state) |
53 | Northeastern University | Massachusetts | $63,141 |
53 | University of Minnesota, Twin Cities | Minnesota | $36,402 (out-state) $16,488 (in-state) |
53 | William & Mary | Virginia | $48,841 (out-state) $25,041 (in-state) |
MIT places second, and Harvard and Stanford tie for third. Yale rounds out the top five.
Private universities, including seven Ivy League colleges, dominate the top of the rankings. Meanwhile, the highest-ranked public schools are tied at 15th, both state schools in California.
For affordability, since the higher ranks are populated by private universities, there tends to be a broad correlation of better universities being more expensive. That said, the most expensive school in the top 50 ranks is actually the University of Southern California, tied at 28th, for $68,237/year.
As it happens, also tied at 28th, the University of Florida is the most affordable public school for in-state students ($6,381/year) and Florida State University tied at 53rd, is the most affordable for out-of-staters at $21,683/year.
However these costs are tuition-only, and don’t account for other necessary expenses: accommodation, food, and textbooks.
Best University versus Best “Fit”
Finding the best university for prospective students is more than just perusing a long ranking list.
Aside from the numerous schools present within each university—which can often be the best for specific majors—factors like location, proximity to family, campus culture, the non-academic pursuits (sports, extracurriculars, internships) are also taken into consideration.
In fact, research has found that just attaining a university degree improves future earnings potential and employability.
Furthermore, individual engagement at college (irrespective of the rank of the school in question) plays a far bigger role in learning and general well-being than simply attending a highly-ranked school.
However, for low income and minority students, attending a top-ranked school does improve future earnings considerably. For women, it also often results in delaying marriage and kids, which results in more work-hours and as a result, more pay.
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